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Water Pollution

Take 10 mL ...

Question

Take $10 m L$ each of hard water two test tube. Add a few drops of soap solution in the first test tube and add the same amount of detergent solution in the second one. Shake both the test tubes well. What do you observe? Which test tube contains more foam?

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Solution

Soap does not lather well in hard water. The hardness of water is due to dissolved calcium and magnesium salts in it. These salts react with soap to form insoluble compounds resulting in the decreases of lather. But detergent do not give insoluble compounds on reaction with these salts. Hence detergent are more effective than soap in hard water.

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