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Solution - Soaps and Detergents

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Questions

Both soap and detergent are some type of salts. What is the difference between them?

What is the difference between the molecules of soaps and detergents, chemically?

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A student takes about 4 ml of distilled water in four test tubes marked P, Q, R and S. He then dissolves in each test tube an equal amount of one salt in one test tube, namely sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tube marked

(A) P and Q

(B) Q and R

(C) P, Q and S

(D) P, R and S

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Explain the formation of scum when hard water is treated with soap.

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Would you be able to check if water is hard by using a detergent?

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 People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?

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Describe in brief the cleansing action of soap.

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Solution for concept: Soaps and Detergents. For the course 8th-10th CBSE
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