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In the removal of water hardness, permutit is regenerated...

In the removal of water hardness, permutit is regenerated with a strong solution of

A.

NaOH

B.

Na $_3$ SO $_4$

C.

Na $_3$ CO $_3$

D.

NaCl

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Correct answer is D

permutit water softener can be regenerated by washing the spent resin with brine( saturated sodium chloride solution). The solution ions replace the calcium or magnesium ions present in it.

$CaR_{2(s)}$ + 2 $NaCl_{aq}$ → $CaCl_{2(aq)}$ + 2 $NaR_{2(s)}$

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