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Why would the presence of bromide or iodide show up as a false positive in the...

Why would the presence of bromide or iodide show up as a false positive in the test for chloride? Include chemical reactions in your explanation.

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Answer #1

I'm assumong this is referring to the chloride test using silver nitrate. The reaction involved in this test is:

And the positive result is the precipitation of white silver nitrate.

The thing is that bromide and iodide react in a similar way with silver ions:

And the result is also a solid white precipitate. This is why the presence of bromide or iodide can result in a false positive for the chloride test, since the signal of a positive result is the same for the three halides.

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