Chapter 15 science 7th .Q4)Explain why - (a) Soap cannot be used in hard water .
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soap cannot be used in hard water because it leaves yellow stains on the clothes
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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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Priyanka Dalvi here.
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