p-Block elementsHard

Question

The reagent(s) used for softening the temporary hardness of water is(are)

Options

A.Ca3(PO4)2
B.Ca(OH)22
C.Na2CO3
D.NaOCl

Solution

Ca(HCO3)2 + Ca(OH)2 → 2CaCO3 ↓ + 2H2O
[Clarke′s method]
NaOCl + H2O ⇋ HOCl + NaOH
OH- + HCO3- → CO22- + H2O
Ca(HCO3)2 + Na2CO3 → CaCO3 ↓ +2NaHCO3 

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