Discussion
In the lime-soda process, lime is used to remove
Answer: D
Correct answer: temporary hardness and magnesium salts
Lime supplies hydroxide, which converts bicarbonate to carbonate so that calcium precipitates as the carbonate, and which precipitates magnesium as its hydroxide. It also deals with dissolved carbon dioxide. What it cannot remove is the permanent calcium hardness, since precipitating calcium sulphate needs a carbonate source rather than a hydroxide one.
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