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The reagent(s) used for softening the te...

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

A

`Ca_(3)(PO_(4))_(2)`

B

`Ca(OH)_(2)`

C

`Na_(2)CO_(3)`

D

`NaOCl`

Text Solution

Verified by Experts

The correct Answer is:
B
Temproray hardnes of water is due to the presence of bicarbonates of calcium and magnesium.
`Ca(HCO_(3))_(2)+Ca(OH)_(2)to2CaCO_(3)+2H_(2)O`
The temporary hardness of water can be removed by the addition of calculated quantity of milk of lime which converts soluble bicarbonates into insoluble carbonates, which can be removed.
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