First slide

Hardness of water

Question

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?

Moderate

Solution

"2" moles of synthetic resin
$\large \xrightarrow{Replaces}{}$
1mole of Ca⁺² ions
$\large 2 \times 206gr \rightarrow 1mole\; of \;Ca^{+2}\; ions$
$\large = \frac{1mole\times1gr}{2\times206gr}$
$\large = \frac{1}{2\times206}$
$\large = \frac{1}{412}$
moles of Ca⁺² ions replaced by one gr of synthetic resin.

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