The molecular formula of a commercial resin used for exchanging ions in water…

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Problem

The molecular formula of a commercial resin used for exchanging ions in water softening is

\text{C}_8\text{H}_7\text{SO}_3\text{Na}

(Mol. wt. 206). What would be the maximum uptake of

\text{Ca}^{2+}

ions by the resin when expressed in mole per gram resin? (1)

\frac{1}{103}

(2)

\frac{1}{206}

(3)

\frac{2}{309}

(4)

\frac{1}{412}