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Explain the formation of scum when hard water is treated with soap.
The precipitate formation of scum is formed when is used for washing clothes. With hard water, a considerable quantity of soap is destroyed by reacting with the and ions of hard water to make an insoluble precipitate.
The precipitate formed by the action of on soap sticks to the clothes being washed and interferes with the cleaning capability of the other . This process makes the cleaning of clothes difficult.
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