Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYMedium

The method used to remove temporary hardness of water is :

Calgon's method

Clark's method

Ion-exchange method

Synthetic resins method

Step-by-Step Solution

Clark's method is used to remove temporary hardness of water, in which bicarbonates of calcium and magnesium are reacted with slaked lime Ca(OH) $_2$ . 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

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