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

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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 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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