Clark's method is used to

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(A) Clark's method is a process used to remove temporary hardness of water caused by calcium bicarbonate $(Ca(HCO_3)_2)$ and magnesium bicarbonate $(M

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Remove temporary hardness of water by adding quick lime or slaked lime

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(A) Clark's method is a process used to remove temporary hardness of water caused by calcium bicarbonate $(Ca(HCO_3)_2)$ and magnesium bicarbonate $(Mg(HCO_3)_2)$.In this method,a calculated amount of lime $(Ca(OH)_2)$ is added to the hard water.The lime reacts with the bicarbonates to form insoluble calcium carbonate $(CaCO_3)$ and magnesium hydroxide $(Mg(OH)_2)$,which can then be filtered out.The chemical reactions are:$Ca(HCO_3)_2 + Ca(OH)_2 \rightarrow 2CaCO_3 \downarrow + 2H_2O$$Mg(HCO_3)_2 + 2Ca(OH)_2 \rightarrow 2CaCO_3 \downarrow + Mg(OH)_2 \downarrow + 2H_2O$

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