Question

When zeolite, which is hydrated sodium aluminimum silicate is treated with hard water, the sodium iions are exchanged with which of the following ion(s)?
(a) $H^{+}$ ions (b) $M{g}^{2+}$ ions (c) $C{a}^{2+}$ ions (d) $S{O}_4^{2-}$

Answer 1

Answers: (b) $M{g}^{2+}$ ions (c) $C{a}^{2+}$ ions

To make hard water soft, zeolite method is used. Sodium zeolite or sodium alumino silicate $(N{a}_{2}A{l}_{2}Si{O}_3-x{H}_{2}O)$ is used it as a unique property of exchanging cation such as $C{a}^{2+}$ and $M{g}^{2+}$ in hard water for sodium ion.