Question

What is problem will arise when soap is used with hard water ?give reason

Answer 1

Answer:

Hard water contains calcium and magnesium ions. When soaps are dissolved in hard water, these ions displace sodium or potassium from their salts and form insoluble calcium or magnesium salts of fatty acids. These insoluble salts separate as scum. This is the reason why soaps do not work in hard water

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Answer 2

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Hard water contains calcium & magnesium salts, the soap reacts with that and form complex compound due to which foam or lather is not produced, instead of that scum is produced.

To avoid this problem, we use Detergents.