The molecular formula of a commercial resin used for exchanging ions in water softening is `C_(8)H_(7)SO_(3)Na` (Mol.wt.206). What would be the maximum uptake of `Ca^(2+)` ions by the resin when expressed in mole per gram resin?

Options

A. `(1)/(412)`
B. `(1)/(103)`
C. `(1)/(206)`
D. `(2)/(309)`

Answer

A

Explanation

`underset(2xx 206 g)underset("OR")underset("2 mol")(2C_(8) H_(7)SO_(3)Na)+underset("1mol")(Ca^(2+)) to (C_(8)H_(7)SO_(3)) Ca+ 2Na^(+)`
Number of moles of `Ca^(2+)` removed by one gram resin `=(1)/(412)` mol]