Which of the following compounds is used for | vedclass

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(B) Temporary hardness is caused by dissolved calcium or magnesium hydrogencarbonate. Clark's method is a chemical process used to remove temporary ha

Vedclass · Accepted Answer

$Ca(OH)_{2}$

Vedclass · Answer

(B) Temporary hardness is caused by dissolved calcium or magnesium hydrogencarbonate. Clark's method is a chemical process used to remove temporary hardness by adding a calculated amount of slaked lime,which is $Ca(OH)_{2}$. In this process,the lime reacts with the bicarbonates to form insoluble precipitates that can be filtered out. The chemical reactions are: $Ca(HCO_{3})_{2} + Ca(OH)_{2} \rightarrow 2CaCO_{3}(\downarrow) + 2H_{2}O$ $Mg(HCO_{3})_{2} + 2Ca(OH)_{2} \rightarrow 2CaCO_{3}(\downarrow) + Mg(OH)_{2}(\downarrow) + 2H_{2}O$ Therefore,$Ca(OH)_{2}$ is the compound used.

Which of the following compounds is used for the softening of hard water by Clark's method?

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