how is scum formed
when a soap is used in water a solid substance we call scum form . This is because charged calcium and magnesium particles present in water react with soap to form an insoluble substance
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Soap does not give foam with hard water due to the formation of scum. The scum is formed by the reaction of soap with calcium and magnesium salts present in hard water. Scum is an insoluble precipitate of calcium and magnesium salts of fatty acids formed by the reaction of soap with hard water.\xa0Soap + Hard water → Calcium salt + Magnesium salt