Chemistry, asked by Anonymous, 4 months ago

explain the formation of scum when hard water is treated with soap?


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Answered by Anonymous
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Hard water often contains salts of calcium and magnesium. Soap molecules react with the salts of calcium and magnesium and form a precipitate. This precipitate begins floating as an off-white layer over water. This layer is called scum. Soaps lose their cleansing property in hard water because of formation of scum.

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