when soap is made to react with hard water to clean the dirt more sapp is required. Why?
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Explanation:
soaps are not suitable for washing clothes when water is hard: Soaps, when used with hard water, does not lather or produce foam easily because of the formation of a curdy precipitate or scum. This scum is created when soaps react with the calcium and magnesium ions present in hard water.
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Hardness in water is caused by the presence of mineral salts – most commonly calcium and magnesium, but sometimes also iron and manganese. The mineral salts react with soap to form an insoluble precipitate known as soap film or scum. This reduces the amount of soap available for cleaning.
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