The reagent (s) that can be used for softening the temporary hardness of water is (are)
A
ion exchange resins
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B
Ca(OH)2
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C
Na6P6O18
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D
None of the above
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Solution
The correct option is BCa(OH)2 Temporary hardness due to bicarbonates of calcium and magnesium. Temporary hardness can be removed by Clark's proces, which involves the addition of slaked lime, Ca(OH)2. Ca(HCO3)+Ca(OH)2→2CaCO3↓+2H2O