how is scum formed ???????
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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 forman insoluble substance. Scum builds up on clothes, baths and sinks. Detergents do not form scum.
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The reaction of Calcium and Magnesium salts ( present in hard water ) with soap molecules results in the creation of an insoluble substance called scum.
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