Question

When zeolite which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion (S)?
A. `H^(+)` ion
B. `Mg^(2+)` ions
C. `Ca^(2+)` ions
D. `SO_(4)^(2-)` ions

Answer 1

Correct Answer - B::C
To make hard water soft, zeolite method is used. Sodium zeolite or sodium alumino silicate `(Na_(2)AI_(2)SiO_(3).xH_(2)O)` is used. It has a unique property of exchanging cations such as `Ca^(2+)` and `Mg^(2+)` in hard water for sodium ion.