why soap do not work in hard water?
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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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Soaps react with calciun or magnesium ions
to form an insoluble substance which results in
wastage of soap.
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