I did that, which led me to use Fe > Fe2+ + 2e-why was this question so hard =S
you look at the Emf table thingo, see which one reaction is higher up and thats the one that oxidises, i.e. that reaction is occurring at the anode. Isn't that the basics of galvanic cells?
I did that, which led me to use Fe > Fe2+ + 2e-
It's further up than lead, so it's oxidised. .:. At Anode (pt). It's reversed, so the potential becomes 0.44V
Then, that leaves Pb to be reduced. So Pb2+ + 2e- > Pb
Thats reduced, so it occurs at the cathode (lead). Potential is -0.13V
.:. 0.44 + -0.13 = 0.31V
Everyone seems to be saying the opposite, but this seems logical. The Fe3+ were spectator ions in solution, not being involved.
If this is wrong, then sorry for leading you all astray.
How can an ion be an electrode?i think i stuffed this up but i dont think platinum can be an electrode as it is inert... thus i sed fe2+ is anode and Pb is cathode... however due to my study of indus chem it may have been more likey for Fe3+ to undego redox bcoz it has a higher E valu... in that case it may have been Pb anode and Fe3+ cathode...anybody agree?
oh no! please tell me it is KNO3
My teacher said KNO3, so it should be KNO3.I actually have no idea lol but my text book says "potassium nitrate is a good choice because NO3 and K do not form any ppts with other ions" so I just went off that. But maybe they do??
Lol....My teacher said KNO3, so it should be KNO3.
Yeah i know, i just asked her if i was right when i put down KNO3Lol....
KNO3 isn't the only electrolyte you can have. There is more than one answer. It can be any salt solution, as long as it doesn't form a precipitate with any of the reacting ions.
But yes. KNO3 is usually the conventional electrolyte.