The molecular formula of a commercial resin used for exchanging ions in water softening is C 8 H 7 S O 3 N a (Molecular weight 206). What would be the maximum uptake of C a 2 + ions by the resin when expressed in mole per gram resin?

Step-by-step solution

2 C 8 H 7 S O 3 - N a + 2 mol ( 2 × 206 = 412 g ) + C a 2 + 1 mol → C 8 H 7 S O 3 - 2 C a 2 + + 2 N a + 1 mol of C a 2 + ≡ 412 g of resin Maximum uptake of C a 2 + ions by the resin = 1 mol 412 g = 1 412 m o l / g