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By adding which of the following process...

By adding which of the following process, permanent hardness of water can be removed.

A

Sodalime

B

Sodium bicarbonate

C

Washing soda

D

Sodium chloride

Text Solution

Verified by Experts

The correct Answer is:
c
Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into insoluble carbonates.
`CaCl_(2) Na_(2)CP_(3) rarr CaCO_(3)+2NaCl`
`CaSO_(4) +Na_(2)CO_(3) rarr CaCO_(3) +Na_(2)SO_(4)`
`Ca(HCO_(3))_(2)+Na_(2)CO_(3)rarr CaCO_(3)+2NaHCO_(3).`
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