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2nd July 2017

Why do we need to acidify after heating with NaOH(aq) in test for halides?

Halides test

Ans: The purpose of acidifying is to neutralise the excess OH- ions that will form a precipitate with Ag+ ions.

This is an often overlooked step in the halides test.

Another common question is why does the precipitate take varying time to appear? This has to do with the type of halide we have.

More common questions here.

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