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Why are soaps ineffective during usage With hard water which contains soluble salts of calcium and magnesium?

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Why are soaps ineffective during usage With hard water which contains soluble salts of calcium and magnesium?
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(i)Composition of soap
(ii) Reason for hardness of water
(iii) Reaction between components of soap and salts imparting hardness to water
(iv) The nature of the products formed
Effect of the products on lather formation
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