First slide

Hardness of water

Question

The group responsible for the removal of cations in ion exchange resin is

Easy

A

–NH₃OH
B

–COOH
C

–OH
D

–SH

Solution

→ 2 R-H + Ca⁺² → (R)₂Ca + 2H⁺
Ca⁺² cation is exchanged by H⁺ of resin

Cl^- Anion of hard water is exchanged by ^-OH anion of resin.

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