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Explain the formation of scum when …

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

Posted by Ishika Kumari 5 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years ago

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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Posted by Pandey Ji 6 months, 1 week ago

CBSE > Class 10 > Science