First slide

Hardness of water

Question

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 ?

Moderate

A

$\frac{1}{412}$
B

$\frac{1}{103}$
C

$\frac{1}{206}$
D

$\frac{2}{309}$

Solution

$2 C_{8} H_{7} {SO}_{3} Na + C a^{2 +} \overset{}{\to} {(C_{8} H_{7} {SO}_{3})}_{2} Ca + 2 {Na}^{+}$
$2 \times 206 g r e \sin = 1 m o l C a^{2 +}$
$1 g {resin=1 mol Ca}^{2 +}$

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