Discussion
Demineralisation by ion exchange uses a cation exchanger in the hydrogen form together with an anion exchanger in the
Answer: C
Correct answer: hydroxyl form
Demineralisation uses two beds in series. The cation exchanger in the hydrogen form replaces every cation with a hydrogen ion, so the water leaving it is a dilute mixture of acids. The anion exchanger in the hydroxyl form then replaces every anion with hydroxide, which neutralises those hydrogen ions to water - so both the salts and the acidity disappear together.
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