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  4. Which one the following removes temporary hardness of water ?

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Q. Which one the following removes temporary hardness of water ?

BITSATBITSAT 2015

Solution:

Temporary hardness is due to presence of bicarbonates of $Ca$ (II) and $Mg$ (II). Temporary hardness is removed by adding lime water or milk of lime. This method is known as Clark's process. Removal of hardness is called softening of water.
$Ca ( OH )_{2}+ Ca \left( HCO _{3}\right)_{2} \rightarrow 2 CaCO _{3} \downarrow+2 H _{2} O$