why soaps form scum instead of lather in hard water?
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When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. ... The new substance, scum, does not dissolve in water.
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Explanation:
hard water contains calcium and magnesium and soap is basically sodium or potassium salt of higher fatty acids when soap is added to hard water corresponding calcium and magnesium salts are formed which being in soluble that dissipated this precipitated second is come reaction taking place
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