1. A way to dissolve Gold is to oxidize it to Au3+. Nitric acid is typically a powerful oxidizing agent. There are two possible redox couple for nitric acid in acidic media: NO3- / HNO2 and NO3- / NO. Which couple would you expect to use in this case? and Why did you choose that?
2. Write the expected redox equation of the dissolution of Au in HNO3
2006-12-08 08:46:55 · 3 answers · asked by Uli S 1 in Science & Mathematics ➔ Chemistry
You must look at the standard electrode potentials of the redox couples that you have stated. The one with the more positive Eo value is the most likely one, because Au is so difficult to oxidise. You should also quote the electrode potential for Au3+/Au, and you should find that one of the (NO3)- electrode potentials is not positive enough to cause the oxidation.
2006-12-08 09:53:27 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
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2016-11-24 23:38:48 · answer #2 · answered by ? 4 · 0⤊ 0⤋
to oxidize Gold, you can only use Aqua regia ( a solution which has nitric acid and hydrogen chlorine )
Au(s) + 6H+(aq) + 3NO3 -(aq) ----> Au3+(aq) + 3NO2(g) + 3H2O
http://en.wikipedia.org/wiki/Aqua_regia
2006-12-08 10:14:37 · answer #3 · answered by James Chan 4 · 0⤊ 0⤋