why soap do not show cleansing action in hard water?
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Soaps are sodium or potassium salts of long chain fatty acids. When soapis added to hard water, the Ca2+ and Mg2+ ions present in hard waterreact with soap. ... The cleaning action of soap is very effective in softwater because it contains negligible calcium and magnesium ions.
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Soaps are sodium or potassium salts of long-chain fatty acids. 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.
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