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Hardness of water is due to presence of salts of
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Correct option is B
Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg on it. These Ca2+ and Mg2+ ions react with the anions of fatty acids present in soaps to form curdy white precipitates. As a result, hard water does not produce lather with soap immediately.
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The molecular formula of a commercial resin used for exchanging ion in water softening is C8H7SO3 Na (mol. wt. = 206). What would be the minimum uptake of Ca2+ ions by the resin when expressed in mole per gram resin ?
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