Give reason for the formation of scum when hard water is treated with soap
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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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Due to the presence of of Calcium and magnesium ions , soaps give insoluble calcium and magnesium salts or fatty acids . These are called scum .
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