scum means?????????????????
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When soap/detergent is used with hard water then it forms an insoluble substance which is called as scum.
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Answer: the insoluble precipitate formed after the reaction of so with the ions of magnesium or calcium present in hard water is called scum.
Explanation: this is formed as a result of reaction between magnesium and calcium ions and the sodium or potassium ions present in The soaps.
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