The Naked Scientists Forum
Non Life Sciences
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30/08/2005 22:52:46 »
I've got seven unknown samples and I need to identify them. Each sample corresponds to a solution of one of these anions (I'm not sure this is the write word in english...they got negative charges): NO3-, Cl-, Br-, I-, SO4 -2, CO3 -2 and OH-. To do this, I can use distilled water, matches and the following solutions: Na+, Cu +2, Pb +2, Ba +2, NH4 +2, HCL, chlorine water and CHCl3 (chloroform).
What is the best way to get this problem solved? Why?
Waiting for an answer,
(sorry if I made some English mistakes...English is not my mother language...)
Re: Unknown Samples
Reply #1 on:
31/08/2005 03:19:31 »
This sounds like a homework problem.
So here's my chemistry teacher answer...
Start by examining the solubilities of various compounds.
Also, look at the reaction between chlorine and the halide ions, in the presence of a nonpolar solvent (it will likely be in your textbook under "halogen displacement" or "halogen replacement" or "metathesis" or their non-English equivalents).
By the way - the ammonium ion is monovalent (NH4 +).