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Chemical Reactions

Explain why, ...

Question

Explain why, soap form scum with heard water whereas detergents do not

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Solution

When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap toform an insoluble substance. Scumbuilds up on clothes, baths and sinks.Detergents do not form scum.

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Q. Why hard water does not form later with soap? What advantages has soap over detergents.

Q. Explain the cleaning action of soap. Why do soap not work in hard water?

Q. Soap form lathers in hard water, but a detergent does not.

Q. Both soap and detergent are some type of salts. What is the difference between them? Describe in brief the cleansing action of soap. Why do soaps not form lather in hard water? List two problems that arise due to the use of detergents instead of soaps.

Q. Explain Why -

(a) Soap cannot be used in hard water .
(b) Oil does not mix in water . However, oil and water become homogeneous if a sufficient quantity of detergent is added .
(c) Synthetic detergents are superior to soap .
(d) Often coloured spots are formed on clothes during washing .
(e) Tobacco masheri should not be used for cleaning teeth.

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