This is apropos of news item, ‘Bangladesh court outlaws ‘Banglish’, published on 17 February. As per the report, Bangladesh high court has ordered radio and TV presenters and anchor persons not to use words which are foreign to Bengali language. This order came as an effort to protect Bengali language in the backdrop of widespread distortion of the language with usage of English. Unfortunately, this phenomenon is not limited to Bangladesh but is present in all the third world countries. In our region, we see it in the form of Urduish, Hindish, Punjablish and so on.
It is true that with the advent of technological and media advancement, of which the English is the major torch bearer, even the non-English speaking developed countries are not immune to an imminent danger to their own languages. I don’t think that mere a court order can make much difference; it’s an attitude issue. People speaking English or heavily mixing it with their own language feel better off than others. I don’t think it’s a superiority complex (though they think it that way) but a sign of weakness.
Unless we accord our mother tongue or national language a bread earning status, court order will remain just a piece of paper. Civil society, media, educationists, intellectuals, nationalists should close ranks and exert pressure on their respective governments to take up the cause to save the ones country’ language, and that’s possible by making it the official language of the country in all respects.
Otherwise, our languages will not be able to resist the West’ technological and media attack which is forcing people to even think in foreign languages. Once we stop thinking in our own language, we stop producing genuine literature and arts. Even this may impact our political directions as well. Bangladesh’ court order should be taken as a wakeup call.
MASOOD KHAN
Jubail, Saudi Arabia

Link: (retrieved on 21st February, 2012)

On 16 May 2009 the United Nations General Assembly in its resolution A/RES/61/266 called upon Member States “to promote the preservation and protection of all languages used by peoples of the world”. By the same resolution, the General Assembly proclaimed 2008 as the International Year of Languages, to promote unity in diversity and international understanding, through multilingualism and multiculturalism.

Click to view slideshow.
International Mother Language Day has been observed every year since February 2000 to promote linguistic and cultural diversity and multilingualism. The date represents the day in 1952 when students demonstrating for recognition of their language, Bangla, as one of the two national languages of the then Pakistan, were shot and killed by police in Dhaka, the capital of what is now Bangladesh.

Languages are the most powerful instruments of preserving and developing our tangible and intangible heritage. All moves to promote the dissemination of mother tongues will serve not only to encourage linguistic diversity and multilingual education but also to develop fuller awareness of linguistic and cultural traditions throughout the world and to inspire solidarity based on understanding, tolerance and dialogue.

One way to test for contamination in water from lakes, rivers and streams is with a bioassay.

A bioassay uses a living organism–usually a plant or a bacteria–as a test agent for the presence or concentration of a chemical compound or a disease. The idea is to choose a test agent that is very sensitive to the condition you are testing.

Have you ever read about how miners took canaries down into mines to act as early warnings of gas leaks? Because canaries are more sensitive to gas than people, the birds reacted to very small amounts of gas and gave miners a chance to escape. You could say canaries were a bioassay for underground gas.

Different plants are often used as bioassays because they respond in a predictable way and are often very sensitive to the condition that is being tested. A standard toxic dose–the level at which no seeds of the bioassay plant sprout or all the plants die–is established as a reference point. Then samples are tested and compared to the reference standard.

Of all the possible water-quality bioassay organisms, lettuce might be one of the last you would think of. Lettuce doesn’t live in water, so why use it to test water quality? The reason is lettuce bioassays are inexpensive, easy to do, and the seeds are pretty sensitive to some types of contaminants in water, including heavy metals, pesticides and other organic toxins. Although any variety of lettuce may do, Lactuca sativa Buttercrunch is the standard variety recommended for bioassays by the U.S. Environmental Protection Agency, the Food and Drug Administration, and the Organization for Economic Cooperation and Development.

You might try taking a series of samples along one stream or compare streams near industry to water running though agricultural areas.

Directions for conducting experiments can be found at: Lettuce Bioassay. (http://ei.cornell.edu/toxicology/bioassays/lettuce/)

ACID RAIN

For most of the following experiments, you will need a pH indicator, such as wide-range litmus or pH paper, a garden soil pH testing kit, or a pH indicator that you can make yourself in Experiment 3. These pH indicators contain a chemical that changes color when it comes in contact with acids or bases. For example, litmus and pH paper turn red in strong acids and blue in strong bases. Because only a few pH indicators measure pH over a wide range of pH values, you will need to find out the pH range of the indicator you use. Typically, the color chart provided with each pH indicator kit will show the pH range of that indicator. Color pH indicators provide only an approximate measure of the pH, or the strength of the acid or base. They are not as accurate as the expensive instruments scientists use to measure pH, but they are adequate for the following experiments.

Measuring With pH Paper
When measuring pH with pH paper, dip the end of a strip of pH paper into each mixture you want to test. After about two seconds, remove the paper, and immediately compare the color at the wet end of the paper with the color chart provided with that pH indicator. Write down the pH value and color. Always use a clean, unused strip of pH paper for each mixture that you test.

Measuring Liquids with a Garden Soil pH Test Kit
Soil pH test its are designed to measure the pH of soil, but they may also be used to measure the pH of liquids, such as water and water mixtures. Most of these kits contain a test solution (liquid pH indicator), color chart, and clear plastic test container, such as a test tube.
To measure pH, pour 1/4 teaspoon of the mixture you want to test into the test container, and add 1/4 teaspoon of the test solution provided in the kit. Cover the container and shake once or twice to mix, or stir if necessary. Compare with the color chart provided with the kit and write down the result.

Tips
- Except for pH test paper, all the materials called for in these experiments, including distilled water and borax, can be obtained at grocery stores or from local lawn and garden stores or nurseries.
- pH test paper can be ordered online.
- Inexpensive garden soil pH testing kits are available at most lawn and garden stores or nurseries. These testing kits usually contain a pH indicator solution that covers a range of at least pH 4 to 10, which is wide enough for most of the following experiments.
- You may substitute baking soda for household ammonia in the experiments. If you do, be sure to stir well because baking soda does not dissolve easily in water unless heated. The pH of undissolved baking soda will not be the same as dissolved baking soda.
- You may substitute fresh-squeezed lemon juice for white vinegar. Lemon juice is slightly more acidic than the vinegar sold in grocery stores. White vinegar is preferred over cider vinegar or lemon juice because it is colorless and relatively free of impurities.
- Use clean, dry containers and utensils.

Experiment 1: Measuring pH

This experiment will illustrate how to measure the approximate pH of chemicals in water using a pH indicator. A pH indicator is a chemical that changes color when it comes in contact with acids or bases.

Materials
- pH paper and color chart (pH range 3 to 12) or garden soil pH testing kit distilled water (available at grocery stores and drug stores)
- white vinegar
- household ammonia (or baking soda)
- 3 small, clear cups or glasses
- 3 stirring spoons
- measuring cups and spoons (1/2 cup, 1/4 and 1 teaspoon)
- notebook and pencil

Instructions
- Rinse each cup with distilled water, shake out excess water, and label one cup vinegar, the second cup ammonia, and the third cup water.
- Pour 1/2 cup distilled water into each of the 3 cups.
- Add 1/2 teaspoon white vinegar to the vinegar cup and stir with a clean spoon.
- Add 1/2 teaspoon ammonia to the ammonia cup and stir with a clean spoon.
- Do not add anything to the water cup.
- Dip an unused, clean strip of pH paper in the vinegar cup for about 2 seconds and immediately compare with the color chart. Write down the approximate pH value and set the cup aside. (If using a garden soil pH tester kit, pour 1/4 teaspoon of the contents of the vinegar cup into the test container, and add 1/4 teaspoon of the test solution. Cover the test tube and shake once or twice to mix, or stir if necessary. Compare with the color chart provided in the kit, and record the result.)
- Dip an unused, clean strip of pH paper in the ammonia cup for about 2 seconds and immediately compare with the color chart. Write down the approximate pH value and set the cup aside. (If using a garden soil pH tester kit, repeat the same process in step 6 using the contents of the ammonia cup instead of the vinegar cup.)
- Dip an unused, clean strip of pH paper into the water cup for about 2 seconds and immediately compare with the color chart. Write down the approximate pH value. (If using a garden soil pH tester kit, repeat the same process above using the contents of the water cup instead of the ammonia cup.)

Questions and Answers

Is vinegar an acid or a base?
Vinegar is an acid, and in this experiment it will display a pH of about 4. Vinegar at pH 4 turns pH paper yellow and most other pH indicators red.

Is ammonia an acid or a base?
Ammonia is a base and in this experiment it will display a pH of about 12. Bases turn most pH indicators blue.

Did distilled water have a neutral pH?
PURE distilled water would have tested neutral, but pure distilled water is not easily obtained because carbon dioxide in the air around us mixes, or dissolves, in the water, making it somewhat acidic. The pH of distilled water is between 5.6 and 7. To neutralize distilled water, add about 1/8 teaspoon baking soda, or a drop of ammonia, stir well, and check the pH of the water with a pH indicator. If the water is still acidic, repeat the process until pH 7 is reached. Should you accidentally add too much baking soda or ammonia, either start over or add a drop or two of vinegar, stir, and recheck the pH.

Experiment 2: Determining the pH of Common Substances

In this experiment you will use a pH indicator to measure the pH of some fruits, common beverages, and borax. Borax is a cleaning agent that some people add to their laundry detergent. It is available at grocery stores. Many foods and household cleaners are either acids or bases. Acids usually taste sour, and bases bitter. Household cleaners are poisons so you should never taste them.

Materials
- pH paper and color chart (range pH 2 to 12) or garden soil pH testing kit
- 3 fresh whole fruits (lemon, lime, orange, or melon)
- 3 beverages (cola, carbonated non-cola, milk)
- 1/8 teaspoon borax
- measuring spoons (1/4 and 1/8 teaspoons)
- 4 small, clear cups or glasses
- 1 clean stirring spoon
- notebook and pencil
- paring knife

Instructions
- Cut each fruit in half, drying off the knife after each cut.
- Place an unused strip of pH paper half-on and half-off the inside of the cut fruit. Leave until wet (about 2 seconds). Immediately compare with the color chart. Write down the approximate pH value of the fruit. (If using a garden soil pH tester kit, squeeze 1/4 teaspoon of juice from the cut fruit into the test container, and add 1/4 teaspoon of the test solution. Cover the test container and shake once or twice to mix, or stir if necessary. Compare with the color chart provided in the kit, and record the result.)
- Repeat the same process for the other 2 fruits.
- Label the 3 cups: one cola, another non-cola, and the third milk.
- Pour each liquid into an appropriately labeled cup.
- Dip an unused strip of pH paper into the cola, compare with the color chart, and record the result. Repeat the same process for the remaining beverages. Be sure to use a clean, unused strip of pH paper for each one. (If using a garden soil pH tester kit, pour 1/4 teaspoon of cola into the test container, and add 1/4 teaspoon of the test solution. Tightly press your finger over the top of the test container and shake once or twice to mix, or stir if necessary. Compare with the color chart provided in the kit, and record the result.)
- Add 1/8 teaspoon borax to 1/4 cup distilled water and stir for about 2 minutes.
- Dip an unused strip of pH paper in the borax mixture, compare with the color chart, and record the result. (If using a garden soil pH tester kit, pour 1/4 teaspoon of the borax/water mixture into the test container, and add 1/4 teaspoon of the test solution. Tightly press your finger over the top of the test container and gently shake, or stir if necessary. Compare with the color chart provided in the kit and record the result.)

Questions and Answers

Are lemons, limes and oranges acids or bases?
These fruits all contain acids and taste sour. Lemons and limes have pH values near 2. Oranges may be slightly less acidic than lemons and limes, but your pH indicator may not be accurate enough to show the difference.

Are colas and non-colas acids or bases?
They are both acidic, primarily becasue they both contain carbon dioxide to make them fizz, and carbon dioxide and water produce carbonic acid. The pH of these beverages varies with the amount of carbon dioxide and other ingredients in them, but it is usually below 4.

Was the milk acidic or basic?
Milk can be slightly basic or slightly acidic depending on its age and how it was processed at the dairy.

Was the borax/water mixture acidic or basic?
Borax contains a strong base and will turn most pH indicators blue. The approximate pH of the borax/water mixture is 9. Its alkaline properties make it an excellent cleaning agent, which is why some people use it to wash clothes.

Experiment 3: Making a Natural pH Indicator

In this experiment you will make your own pH indicator from red cabbage. Red cabbage contains a chemical that turns from its natural deep purple color to red in acids and blue in bases. Litmus paper, another natural pH indicator, also turns red in acids and blue in bases. The red cabbage pH indicator can be obtained by boiling the cabbage.

Materials
- sliced red cabbage
- stainless steel or enamel pan or microwave casserole dish
- 1 quart water
- stove, microwave, or hotplate
- white vinegar
- ammonia or baking soda
- clear, non-cola beverage
- 3 glass cups (preferably clear)
- measuring spoons
- 3 clean teaspoons for stirring
- measuring cup (1/4 cup)
- notebook and pencil

Instructions
- Boil cabbage in a covered pan for 30 minutes or microwave for 10 minutes. (Don’t let water boil away.)
- Let cool before removing the cabbage.
- Pour about 1/4 cup of cabbage juice into each cup.
- Add 1/2 teaspoon ammonia or baking soda to one cup and stir with a clean spoon.
- Add 1/2 teaspoon vinegar to second cup, stir with a clean spoon.
- Add about 1 teaspoon clear non-cola to the last cup and stir with a clean spoon.
- After answering the first two questions for this experiment, pour the contents of the vinegar cup into the ammonia cup.

Related Experiment: Neutralizing Acids or Bases Using a Garden Soil pH Tester Kit
- Pour 1/4 teaspoon of the contents of the vinegar cup into the test container, and add 1/4 teaspoon of the test solution. Seal the top of the test container with your finger, shake once or twice, or stir if necessary, and compare with the color chart. Then pour about 1/4 teaspoon of the contents of the ammonia cup into the test container. Mix it and compare with the color chart. What happens to the pH ? What would happen if you added more of the ammonia mixture? (For answers: see questions 3 and 4.)

Questions and Answers What color change took place when you added vinegar to the cabbage juice? Why?
The vinegar and cabbage juice mixture should change from deep purple to red, indicating that vinegar is an acid.

Did the ammonia turn the cabbage juice pH indicator red or blue? Why?
The ammonia and cabbage juice mixture should change from deep purple to blue, because ammonia, like baking soda, is a base, which reacts chemically with the pH indicator, turning it blue.

What happens to the color if you pour the contents of the vinegar cup into the ammonia cup?
You should find that the acid and base are neutralized, changing the color from blue or red to purple, which is the original, neutral color of the cabbage juice

If you were to gradually add vinegar to the cup containing the baking soda (or ammonia) and cabbage juice, what do you think would happen to the color of the indicator? Try it, stirring constantly.
As you add more vinegar, the acid level increases and the color becomes red.

Is the non-cola soft drink acidic or basic?
It is acidic and turns the cabbage juice pH indicator red.

Experiment 4: Measuring Soil pH

In this experiment you will collect soil and measure its pH. Soil pH is one of several important conditions that affect the health of plants and animals. In addition, you will also be asked to survey the plants and animals that live in the area where you collected the soil. Area surveys provide information about how well plants and animals can live under different conditions.

For this experiment, you will need an inexpensive garden soil pH test kit, which may be obtained from lawn and garden stores or nurseries.

Materials
- garden soil pH test kit
- distilled water
- 2 cups soil from each of two or three different locations (some of the soil will be needed for the “Soil Buffering” experiment)
- measuring spoons
- digging tool
- self-sealing plastic bags
- notebook and pencil

Instructions
- Pick two or three different soil locations, such as a garden, wooded area, city park, or meadow. Ask an adult to go with you.
- At each location, observe the plants and animals living in or rooted on these soils, especially those that are in greatest numbers. Write down as much as you can about what you find. Dig down about 2 inches, scoop out 2 cups of soil, and seal it in a plastic bag for later use. Label each plastic bag. Be sure to clean your digging tool after collecting soil samples at each location.
- Measure the pH of each soil sample following the directions provided in the garden soil pH test kit, and record the approximate pH of each soil sample.
- Save the excess soil from each site for use in the “Soil Buffering” experiment.

Questions and Answers

Were there any big differences between the plant and animal life at each location?
Some types of plants and animals are able to live in acid soils, while others are not. Be aware, however, that many factors, not just the soil acidity, determine the types of plants and animals that occur at a particular site.

Were any of your soil samples acidic?
Some plants require acid soils to grow and thrive. For example, pine trees, azaleas, rhododendrons, cranberries, blueberries, potatoes, and tomatoes prefer acid soils. However, most plants thrive only in soils of pH 6 to 7.

Were any of your soil samples basic?
Some soils, such as in many midwestern United States, contain a lot of limestone and are alkaline. In those locations, people often add sulfate, such as ammonium bisulfate to soil to make it less basic.

Experiment 5: Soil Buffering

Soil sometimes contains substances, like limestone, that buffer acids or bases. Some salts in soil may also act as buffers. In this experiment you will find out if soil from your lawn, garden, or school can buffer acids. You will observe the pH change of an acid mixture poured over soil in a filter. If the water collected from the filter is less acidic than the original mixture, then the soil is buffering some of the acid. If it does not change, then the soil may not be capable of buffering acids. Since the buffering capability of soils differs, you may want to do this experiment with several different soil types including those collected for the “Soil pH” experiment.

Materials
- pH paper and color chart (pH range 2 to 10) or garden soil pH test kit
- about 2 cups of soil from a garden, wooded area, lawn, or school yard
- distilled water
- white vinegar
- measuring cups and spoons
- stirring spoon
- large funnel
- 3 coffee filters
- paper cup
- notebook and pencil

Instructions
- Pour 1 teaspoon of vinegar into 2 cups of distilled water, stir well, and check the pH with either pH paper or a garden soil pH testing kit. The pH of the vinegar/water mixture should be about 4. If it is below that, add a sprinkle of baking soda, stir well, and recheck the pH; but if it is above pH 4, add a drop or two of vinegar and again recheck the pH.
- Put 1 coffee filter into the funnel, and fill the filter with soil from one location. Do not pack the soil down.
- Hold the filter over a paper cup and slowly pour the vinegar/water mixture over the soil until some water collects in the paper cup (the filter may clog quickly, but you need only a small amount of water).
- Check the pH of the collected water using either pH paper or a garden soil pH testing kit and record the results.
- Repeat the experiment with other soil samples, using a new coffee filter for each sample.

Questions and Answers

Did the pH of the collected water stay the same as the original mixture, increase, or decrease?
If the pH stayed the same, the soil did not buffer the acid. Each pH value above 4 indicates that the soil buffered increasing amounts of the acid. Even soil capable of buffering acids can be overpowered if enough acid is added. As more acid is added to the soil, the buffering capability decreases, and the water from the filter becomes more acidic.

What can you add to the soil to increase its buffering capability?
Limestone can be added, but it takes weeks to months for the limestone to work into the soil.

Experiment 6: Observing the Influence of Acid Rain on Plant Growth

Acid rain most often damages plants by washing away nutrients and by poisoning the plants with toxic metals. It can, however, have direct effects on plants as well. In this experiment you will observe one of the direct effects of acid water on plant growth. The experiment will take about 2 weeks.

Materials
- 4 cups or jars
- distilled water
- white vinegar
- measuring cups
- stirring spoon
- 2 cuttings of a philodendron plant (1 leaf and small amount of stem)
- 2 cuttings of a begonia or coleus plant (1 leaf and small amount of stem)
- notebook and pencil

Instructions
- Pour 1 teaspoon of vinegar into 2 cups of distilled water, stir well, and check the pH with either pH paper or a garden soil pH testing kit. The pH of the vinegar/water mixture should be about 4. If it is below pH 4, add a sprinkle of baking soda, or a drop of ammonia, stir well, and recheck the pH. If it is above pH 4, add a drop or two of vinegar and again recheck the pH.
- Measure the pH of the distilled water using either pH paper or a garden soil pH testing kit. If the pH is below 7, add about 1/8 teaspoon baking soda, or a drop of ammonia, stir well, and check the pH of the water with the pH indicator. If the water is still acidic, repeat the process until pH 7 is reached. Should you accidentally add too much baking soda or ammonia, either start over again or add a drop or two of vinegar, stir, and recheck the pH.
- Put one of the following labels on each cup or jar:
- water philodendron
- acid philodendron
- water begonia (or coleus)
- acid begonia (or coleus)
- Pour about a cup of distilled water into the water-philodendron and water-begonia cups.
- Pour about a cup of the vinegar/water mixture into the acid-philodendron and acid-begonia cups.
- Put one philodendron cutting into each philodendron labeled cup, covering the stem and part of the leaf with the liquid.
- Put one begonia cutting into each begonia-labeled cup, covering the stem and part of the leaf with the liquid.
- Set the cups where they are not likely to be spilled and where they will receive some daylight.
- About every 2 days, check to be sure that the plant cuttings are still in the water or vinegar/water. You may need to add more liquid if the cups become dry.
- After 1 week, compare the new root growth of each plant in distilled water with the new root growth of its corresponding plant in acid water. Record the results.
- After 2 weeks, again observe the plant cuttings for new root growth, and record the results.

Questions and Answers

Which plant cuttings had the fastest root growth, those in distilled water or those in acid water?
The plants grown in distilled water should grow faster than plants grown in acid water. Acid water, like acid rain, can directly damage plants and slow or stop new growth.

Experiment 7: Observing Buffers in Lakes, Ponds, and Streams

In this experiment you will observe the effects of limestone on the acidity of water. Some areas of the nation have a lot of limestone in lake bottoms and in soil, which helps neutralize the effects of acid rain. Crushed limestone is sometimes added to lakes, ponds, and other aquatic areas to help neutralize the effects of acid rain, thus preserving important aquatic systems until the source of acid rain can be reduced. Crushed limestone is easily obtained from local lawn and garden stores or nurseries.

Materials
- pH paper and color chart (pH range 2 to 7) or garden soil pH testing kit
- white vinegar
- distilled water
- measuring cup and spoon
- 2 stirring spoons
- 1/2 cup crushed hydrated limestone or spray limestone
- 2 cereal bowls (about 2 cup size)
- plastic wrap
- notebook and pencil

Instructions
- Label one bowl vinegar; the other one vinegar plus limestone.
- Pour 1/4 cup crushed limestone into one bowl.
- Pour 1 teaspoon of vinegar into 2 cups of distilled water, stir well, and check the pH with either pH paper or a garden soil pH testing kit. The pH of the vinegar/water mixture should be about 4. If it is below pH 4, add a sprinkle of baking soda, stir well, and recheck the pH; but if it is above pH 4, add a drop or two of vinegar and again recheck the pH.
- Pour about 1 cup of the vinegar/water mixture over the limestone in the cereal bowl and stir with a clean, dry spoon.
- Pour the remaining vinegar/water mixture into the other cereal bowl.
- Check the pH of the vinegar/water mixture over the limestone and record it.
- Cover each bowl with plastic wrap to prevent evaporation.
- Every day for 6 days, stir the contents of each bowl with a clean, dry spoon and about 4 or more hours later (after the limestone has settled), test the pH of the water mixture in each bowl and record the result.

Questions and Answers

Did the pH of the vinegar/water mixture over the limestone become more or less acidic during the 6-day period? Why?
The water mixture should have become less acidic, changing from about pH 4 to as much as pH 6, depending on the water content of the limestone you used.

Does crushed limestone buffer the acid?
Yes, by neutralizing it.

Did the pH of the vinegar/water mixture in the other bowl (without limestone) change during the 6-day period?
The pH of the bowl without limestone should not have changed.

Experiment 8: Looking at Acid’s Effects on Metals

When acids and metals come in contact with each other, the metal is gradually dissolved away in a chemical reaction. In this experiment you will observe this reaction for yourself, but you will need patience. The chemical effect of acids on metals may take at least five days for the human eye to see, even though the reaction starts as soon as the acid contacts the metal.

Materials
- pH paper and color chart (pH range 2 to 7) or garden soil pH testing kit
- 2 small, clear glasses (nonmetal)
- 2 clean copper pennies (use pennies minted before 1983)
- white vinegar or fresh-squeezed lemon juice
- distilled water
- plastic wrap
- notebook and pencil

Instructions
- Label one glass water and the other vinegar or lemon juice depending on which acid you use.
- Place one penny in each glass. Be sure to use pennies minted before 1983 because pennies minted after that time have a different chemical composition.
- Barely cover one of the pennies with either vinegar or lemon juice.
- Dip a strip of pH paper into the vinegar, or lemon juice, for about 2 seconds, compare with the color chart, and record the result. Or use a garden soil pH test kit.
- Add enough distilled water to the glass labeled water to barely cover the other penny.
- Dip a strip of pH paper into the distilled water for about 2 seconds and compare with the color chart. Or use a garden soil pH test kit. If the pH is below 6, add a tiny amount (less than 1/8 teaspoon) of baking soda, or a drop of ammonia, and recheck the pH. Repeat this process until the pH is between 6 and
- Record the pH of the water.
- Seal the top of each glass with plastic wrap to prevent evaporation.
- Place in a safe, dry place for about 5 days.
- After about 5 days, observe the changes that occurred in each glass.
- At the end of the experiment, wash off the pennies with water, and pour the contents of the glasses down the sink (do not drink).

Questions and Answers

What change, if any, took place in the water glass after 5 days?
There should be no change

What change, if any, took place in the vinegar (or lemon juice) glass after 5 days?
The liquid should be bluish-green. The bluish-green substance in the vinegar, or lemon juice, comes from the copper in the penny. It is a byproduct of the chemical reaction in which the acid in the vinegar, or lemon juice, very gradually eats away the penny.

When you rinsed off the pennies, were you surprised that they both looked about the same as they did at the beginning of the experiment (assuming you used clean pennies)?
The chemical reaction between the acid and the copper penny is so slow that you cannot see any difference in the shape of the metal in just 5 days, at least not with your eye alone. You may see some changes after about two weeks, especially at the edge of the penny.

(Source: http://www.sciencemadesimple.com/environmental_projects.html retrieved on 17.2.2012)

Happy New Year & Best wishes to all our visitors

2nd year students are requested to obtain their clearance certificate from the Central Library.

B.A./ B.Sc. Part -II Form Fill up – important dates:

13.2.2012- 16.2.2012, 21.2.2012-24.2.2012, 27.2.2012 and 29.2.2012

Time: 12 P.M. – 1 P.M.

Requirements:

College Fee Deposit Receipt & Acknowledgment Card

Identity Card

Mark Sheets (HS and others)

Caste Certificate (where applicable)

Library Clearance

]]> http://vclibrary.wordpress.com/2012/01/03/are-you-facing-any-problem/feed/ 0 books_wel vclibrary http://vclibrary.wordpress.com/2011/12/17/newton-papers/ http://vclibrary.wordpress.com/2011/12/17/newton-papers/#comments Fri, 16 Dec 2011 18:39:14 +0000 vclibrary http://vclibrary.wordpress.com/?p=240 ]]> Cambridge University Library holds the largest and most important collection of the scientific works of Isaac Newton (1642-1727). We present here an initial selection of Newton’s manuscripts, concentrating on his mathematical work in the 1660s. Over the next few months we will be adding further works until the majority of our Newton Papers are available on this site.

Newton was closely associated with Cambridge. He came to the University as a student in 1661, graduating in 1665, and from 1669 to 1701 he held the Lucasian Chair of Mathematics. Under the regulations for this Chair, Newton was required to deposit copies of his lectures in the University Library. These, and some correspondence relating to the University, were assigned the classmarks Dd.4.18, Dd.9.46, Dd.9.67, Dd.9.68, and Mm.6.50.

In 1699 Newton was appointed Master of the Mint, and in 1703 he was elected President of the Royal Society, a post he occupied until his death.

After his death, the manuscripts in Newton’s possession passed to his niece Catherine and her husband John Conduitt. In 1740 the Conduitt’s daughter, also Catherine, married John Wallop, who became Viscount Lymington when his father was created first Earl of Portsmouth. Their son became the second earl and the manuscripts were passed down succeeding generations of the family.

In 1872 the fifth earl passed all the Newton manuscripts he had to the University of Cambridge, where they were assessed and a detailed catalogue made. Based on this catalogue, the earl generously presented all the mathematical and scientific manuscripts to the University, and it is these that form the Library’s ‘Portsmouth collection’ (MSS Add. 3958-Add. 4007).

The remainder of the Newton papers, many concerned with alchemy, theology and chronology, were returned to Lord Portsmouth. They were sold at auction at Sotheby’s in London in 1936 and purchased by other libraries and individuals.

In 2000 Cambridge University Library acquired a very important collection of scientific manuscripts from the Earl of Macclesfield, which included a significant number of Isaac Newton’s letters and other papers.

Links: http://cudl.lib.cam.ac.uk/collections/newton

Other Links: http://www.newtonproject.sussex.ac.uk/prism.php?id=1

“Not many people know about it, but the damage done to your lungs by one mosquito coil is equivalent to the damage done by 100 cigarettes. This was according to a recent study conducted in Malyasia,” said Chest Research Foundation director Sandeep Salvi.

He was speaking at the conference ‘Air Pollution and Our Health’, organised by the Centre for Science and Environment (CSE) along with the Indian Council for Medical Research and the Indian Medical Association.

Mr Salvi said there is a lack of awareness about the impact of air pollution on human health.

Pointing out the “lack of research culture” among Indian doctors, Salvi said that indoor air pollution too is a health risk factor.

Participants at the event, which included doctors and health researchers, also spoke about vehicular air pollution in the capital.

According to estimates, about 55 per cent of Delhi’s population lives within 500 metres from main roads – and is, therefore, prone to a variety of physical disorders.

“The vehicular pollution is a major concern for the environment. The rising incidents of genetic disorder have a lot to do with air pollution. India loses one million children under five because of respiratory problems every year,” said Sanjeev Bagai, the chief executive officer of Batra Hospitals.

He said industries also contribute to the air pollution and these need to be shifted out of the capital.

Date: 9th and 10th December, 2011 at the “Acharya Prafulla Chandra Alochona Kakshya”- 17, Bidhan Sarani, Kolkata- 700006 (Vidyasagar College Bidhan Sarani Campus).

This seminar was organized in collaboration with Zoological Survey of India, Kolkata.

Theme: “Natural and anthropogenic Hazards of Environment- Their Impact on Biodiversity and Conservation, and Biotechnological approach for its Remedies”: .

Contact for further details: gobindasadhukhan@gmail.com (+91 9433236599)/ neeldebasish@gmail.com (+91 9830304095)/ dutta.kaustuv@rediffmail.com (+91 8981588014)

বাংলা উপন্যাস সাহিত্যে শরৎচন্দ্র এমন একটি নূতন পথ ধরে অগ্রসর হয়েছেন যা বাঙলা কথাসাহিত্যের পরিধিকে প্রসারিত করে দিয়ে তার মধ্যে এনেছে এক অদৃষ্টপূর্ব বৈচিত্র্য। সংবেদনশীল হৃদয়, ব্যাপক জীবনজিজ্ঞাসা, প্রখর পর্যবেক্ষণশক্তি, সংস্কারমুক্ত স্বাধীন মনোভঙ্গি প্রভৃতির গুণে শরৎসাহিত্য লাভ করেছে এক অনন্যসাধারণ বিশিষ্টতা যা পরবর্তীকালের বাঙলা সাহিত্যের গতিপ্রকৃতিকে অনেকাংশে নিয়ন্ত্রিত করেছে।

শরৎচন্দ্রের সমস্ত উপন্যাস ও ছোট গল্পগুলিকে প্রধানত পারিবারিক, সামাজিক ও মনস্তত্ত্বমূলক – এই তিন শ্রেণীতে বিভক্ত করলেও তাঁর অধিকাংশ উপন্যাসের কেন্দ্রভূমিতে বিরাজমান রয়েছে বাঙালীর সমাজ সম্পর্কে এক বিরাট জিজ্ঞাসা এবং বাঙালির মধ্যবিত্ত শ্রেণীর অন্তরঙ্গ ও বহিরঙ্গ জীবনের রূপায়ণ। সমাজের বাস্তব অবস্থা নরনারীর জীবনভঙ্গিমা ও জীবনবোধকে নিয়ন্ত্রিত করে তাদের মানসলোকে যে সূক্ষ্ম জটিল প্রতিক্রিয়ার সৃষ্টি করে, শরৎসাহিত্যে আমরা পাই তারই সার্থক রূপায়ণ। বাঙালি মধ্যবিত্ত সমাজের দুঃখবেদনার এতবড় কাব্যকার ইতিপূর্বে দেখিনি আমারা। মূঢ়তায় আচ্ছন্ন সমাজব্যবস্থার নিষ্ঠুর শাসনে লাঞ্ছিত নরনারীর অশ্রুসিক্ত জীবনকথা অবলম্বন করে মানবদরদী শরৎচন্দ্র গদ্যবাহিত যে কতকগুলি উৎকৃষ্ট ট্রাজেডি রচনা করেছেন তাতে বাঙলা সমাজের অতিবিশ্বস্ত ও বহুচিত্রিত এক আলেখ্য উন্মোচিত হয়েছে আমাদের সামনে।

Click here to view the page…