First slide

Hardness of water

Question

The method used to remove temporary hardness of water is

Easy

A

synthetic resin method
B

Calgon's method
C

Clark's method
D

ion-exchange method.

Solution

Clark's process is used to remove temporary hardness of water. In this method quick lime is added. The bicarbonates present in temporary hard water reacts with lime water to form insoluble calcium and magnesium carbonate or hydroxide which can be easily filtered off.
$CaO + H_{2} O \to \underset{Lime water}{Ca {(OH)}_{2}} Ca {(OH)}_{2} + Ca {({HCO}_{3})}_{2} \to 2 {CaCO}_{3} + 2 H_{2} O 2 Ca {(OH)}_{2} + Mg {({HCO}_{3})}_{2} \to 2 {CaCO}_{3} + 2 H_{2} O + Mg {(OH)}_{2}$

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