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Q.

The molecular formula of a commerical resin used for exchanging ions in water softening is C8H7SO3Na (Mol. wt. 206) What would be the maximum uptake of Ca+2 ions by the resin when expressed in mole per gram resin?

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answer is 2.

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Detailed Solution

"2" moles of synthetic resin 1mole of Ca+2 ions  moles of Ca+2 ions replaced by one gr of synthetic resin.
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