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Question

Chemistry Question on GROUP 2 ELEMENTS

The method used to remove temporary hardness of water is:

A

ion-exchange method

B

Synthetic resins method

C

Calgon's method

D

Clark's method

Answer

Clark's method

Explanation

Solution

Clark's method is used to remove temporary hardness of water, in which bicarbonates of calcium and magnesium are reacted with slaked lime Ca(OH)2{Ca(OH)_2}
Ca(HCO3)2+Ca(OH)2−>2CaCO3V+2H2O{Ca(HCO_3)_2 + Ca(OH)_2 -> 2CaCO_3 V + 2H_2 O }
Mg(HCO3)2+2Ca(OH)2−>2CaCO3V+Mg(OH)2V+2H2O{Mg(HCO_3)_2 + 2Ca(OH)_2 -> 2CaCO_3 V + Mg(OH)_2 V + 2H_2 O}