Explain the formation of scum when hard water is treated with soap | Filo
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Class 10

Science

Chemistry

Carbon and its compounds

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Explain the formation of scum when hard water is treated with soap.

Solution: 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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