Softening of hard water is done using sodium aluminium silic... | CHEMISTRY - ADSORPTION | SolveeIt | Solveeit

Today, August 19

Question

Softening of hard water is done using sodium aluminium silicate (zeolite). The causes :

A

Adsorption of Ca2+ and Mg2+ ions of hard water replacing Na+ ions.

B

Adsorption of Ca2+ and Mg2+ ions of hard water replacing Al3+ ions

C

Both (1) and (2)

D

None of these

Answer

Adsorption of Ca2+ and Mg2+ ions of hard water replacing Na+ ions.

Explanation

Solution

Softening of hard water : Ion exchange resins used for softening of hard water is based upon selective and competive adsorption of ions on resins.

Na2Z + Ca+2 $\longrightarrow$ CaZ + 2 Na+

The organic polymers containing groups like –COOH, –SO3H and –NH2 etc. possess the property of selective adsorption of ions from solution. These are quite useful in the softening of water.