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Question
Why is soap not suitable for washing clothes when the water is hard?
Solution
(1) Hard water contains calcium and magnesium salts; and, when a soap is used for washing clothes with hard water, a good amount of it gets utilised in reacting with the calcium and magnesium ions to form an insoluble scum. So, a large amount of soap gets wasted in this process.
(2) The curdy precipitate called scum, produced by the reaction of hard water on soap, sticks to the clothes making them difficult to be cleaned. Therefore, soaps are not suitable for washing clothes in hard water.
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