In the removal of water hardness, permutit is regenerated with a strong solution of
NaOH
Na\(_3\)SO\(_4\)
Na\(_3\)CO\(_3\)
NaCl
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\(NaR_{2(s)}\)