Question

The method used to remove temporary hardnes:
(1) Calgon's method
(2) Clark's method
(3) Ion-exchange method
(4) Synthetic resins method

Answer 1

synthetic resins method

Answer 2

Clark's method is used to remove temporary hardnes of water.

Step by step explanation:

• Clark's method:

In this method, hardness of water can be removed by adding calculated amount of calcium hydroxide then it form insoluble carbonates which are separated by the filtration method.

• The carbonates of calcium and magnesium reacted with slaked lime .

The chemical reactions of Clark's method is as follows.

$\bold{Ca(HCO_{3})_{2}+Ca(OH)_{2}\rightarrow 2CaCO_{3}+2H_{2}O}$

$\bold{Mg(HCO_{3})_{2}+2Ca(OH)_{2}\rightarrow 2CaCO_{3}+Mg(OH)_{2}+2H_{2}O}$

Hence correct option is- 2

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