Define Scum
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Explanation:
When soap is added to hard water , it does not forms lather . The Calcium and Magnesium salts in hard water react with soap and form scum , it is insoluble and floats on the top of the water . And scum is the salt of calcium or magnesium reacts with soap
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Answer:
A layer of dirt or froth on the surface of a liquid known as scum .
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