The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (Mol. wt. 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?

Engineering

Chemistry

Hardness of Water and calculation

Solution Stoichiometry

Question

The molecular formula of a commercial resin used for exchanging ions in water softening is C₈H₇SO₃Na (Mol. wt. 206). What would be the maximum uptake of Ca²⁺ ions by the resin when expressed in mole per gram resin?

$\frac{2}{309}$

$\frac{1}{103}$

$\frac{1}{206}$

$\frac{1}{412}$

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(B) 2C₈H₇SO₃Na + Ca²⁺ $\to_{}^{}$ (C₈H₇SO₃)₂Ca + 2Na+ $\frac{1}{206} mole 0 \frac{1}{2} \times \frac{1}{206} mole = \frac{1}{412} mole \frac{1}{412}$

mole of Ca²⁺ per gram of resin.