Discussion
Consider the following statements about water treatment.
1. Temporary hardness is removed by boiling 2. The zeolite process removes both cations and anions 3. Calgon forms a soluble complex with calcium
Answer: A
The first and third are correct. Zeolite exchanges cations only, so the sulphates and chlorides remain in the water paired with sodium and the total dissolved solids are unchanged. Removing the anions as well requires a hydroxyl-form anion exchanger in series.
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