Can Cu2+ oxidize
1) SO2
2) C2O4(2-)
Does this happens also when the solution is basic?
Cu2+ + H2S ---> CuS + H2
Write and balance the equation, look up the E potentials, calculate E for the rxn. If you get + the rxn proceeds.
Can I ask what would be the products of
Cu2+ + SO2 -->
Cu2+ + C2O4(2-) -->
Thank you very much...
Actually the question was to choose what can oxidize Cu2+ from;
1)H2S 2)SO2 3)KI 4) C2O4(2-)
So had doubts about SO2 and C2O4(2-)
And regarding H2S I've learned that CuS ppt in acidic solution,but haven't heard about CuS ppt in basic solution.So just before choosing and answer I just wanted to make sure.
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I understand your question but the answer is "take your pick". If you want to oxidize SO2 the only choices would be SO3 I would think although thiosulfate could be another possibility. The environment could make a difference, too (aqueous solution or not etc). My gut feeling; however, is no.
With oxaltate, CuC2O4 will ppt as long as the pH is not too acidic (and it won't take much acidity to dissolve CuC2O4). Note, however, that Cu^2+ and C2O4^2- is not a redox reaction.
As for the CuS question, yes that happens in basic solution, too, BUT only if not too basic. Most qual procedures call for this reaction to take place with a 0.3M (H^+) which certainly acid. If it gets too basic you get Cu(OH)2.
I realize I've written a lot and never actually answered your question, because there are too many if, ands, etc etc. My best answers, in short are
1. Probably not
2. Not a redox reaction
3. As long as it isn't too basic so as to ppt Cu(OH)2.