why soap does not form lather in hard water – InterviewSolution

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1.	why soap does not form lather in hard water
Answer» Soft water readily forms lather with soap, but it is more difficult to form lather with hard water. The dissolved calcium ions and magnesium ions in hard water react with the soap to form scum, so more soap is needed. Soapless detergents do not form scum with hard water.

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