Question

Why must the silver nitrate test for chloride ions be done in an acidified solution?

Answer 1

Explain why, in a test for halide ions, the sample is acidified with dilute nitric acid first. Carbonate ions also produce a white precipitate with silver nitrate solution. The acid reacts with any carbonate ionspresent. This removes them, so stopping them giving an incorrect positive result forchloride ions.

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