Discussion
Match the process with the ion it exchanges.
1. Zeolite softening 2. Cation exchange in demineralisation 3. Anion exchange in demineralisation
P. Hydrogen ion Q. Sodium ion R. Hydroxyl ion
Answer: C
Correct answer: 1-Q, 2-P, 3-R
Each process is named by the ion the bed gives up. Zeolite softening works in the sodium form and releases sodium ions in exchange for calcium and magnesium. In demineralisation the cation exchanger is in the hydrogen form and the anion exchanger in the hydroxyl form, so the two released ions combine to make water and the salts disappear entirely.
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