First slide

Hardness of water

Question

After the exhaust of zeolite in ion-exchange method, it is regenerated by using

Moderate

A

HCl
B

NaOH
C

NaCl
D

NaHCO₃

Solution

${MZ}_{2} (s) + 2 NaCl \to_{}^{} {MCl}_{2} + 2 NaZ$ where Z is ion exchange resin.
NaZ is Sodium aluminium silicate hydrate

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