Questions
Which of the following is not a hard water ?
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Correct option is D
Water containing Ca+2, Mg+2 and H+ > 10-7 m is a hard water.
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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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