Which of the following methods is used for th | vedclass

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(B) Clark's method is specifically used to remove the temporary hardness of water,which is caused by the presence of bicarbonates of calcium and magne

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Clark's method

Vedclass · Answer

(B) Clark's method is specifically used to remove the temporary hardness of water,which is caused by the presence of bicarbonates of calcium and magnesium. In this process,calculated amounts of slaked lime,$Ca(OH)_{2}$,are added to the water.The chemical reactions are as follows:$Ca(HCO_{3})_{2} + Ca(OH)_{2} \rightarrow 2 CaCO_{3} \downarrow + 2 H_{2}O$$Mg(HCO_{3})_{2} + 2 Ca(OH)_{2} \rightarrow 2 CaCO_{3} \downarrow + Mg(OH)_{2} \downarrow + 2 H_{2}O$Other methods like washing soda,Calgon's,and ion-exchange are used to remove both temporary and permanent hardness.Hence,option $B$ is correct.

Which of the following methods is used for the removal of only temporary hardness of water?

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