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In demineralisation process , water is usually first passed through the cation exchanger and then through anion exchanger . Why?

In demineralisation process , water is usually first passed through the cation exchanger and then through anion exchanger . Why?

Grade:12th pass

1 Answers

Chemistry Expert - askIITians
askIITians Faculty 36 Points
4 years ago
Cation exchanger are installed prior to anion exchanger because of the fact that the water should be completely free from hardness before entering the anion exchanger. If there will be any hardness in water else there will be precipitation on the Anion resin bed.

Since, hardness is due to Calcium and Magnesium (which are cations only).

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