How do I test for the contamination of water with iodide ions?

1 Answer
anor277
Nov 7, 2016

Make solutions of Pb(NO_3)_2(aq) and NaI(aq)

Explanation:

Pb^(2+) + 2I^(-) rarr PbI_2(s)darr

Lead iodide is very insoluble, and precipitates from aqueous solution as a canary yellow solid. So treat the water from the pipe with Pb(NO_3)_2(aq) to see if precipitation occurs.

I propose that you test the reaction by mixing Pb(NO_3)_2(aq) with NaI(aq) so that the results of a positive test can be appreciated.

And now test the water from the pipes with sodium iodide in a separate reaction.

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