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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

soda lime

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 calsium and magnesium compounds into insoluble carbonates.
`CaCl_(2)+Na_(2)CO_(3) rarr CaCO_(3)+2NaCl`
`CaSO_(4)+Na_(2)CO_(3) rarr CaCO_(3)+Na_(2)SO_(4)`
`Ca(HCO_(3))_(2) rarr CaCO_(3)+2NaHCO_(3)`
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