ocr a level chemistry question Watch
I understand how to work out the standard cell potential but how do you work out the sign of the Ni electrode?
Well if you can work out the electrode potentials of the cell you’ve created then you can work out the sign... basically for the standard cell electrode you take the most negative away from the most positive one, so you have therefore identified which is your positive terminal and will therefore have a + sign and which is the negative terminal and will therefore have a - sign, does that makes sense?
not sure but thanks a lot anyway ....
for the first one it's 0.77 -(-0.25)
why is the sign of the Ni electrode negative?
2H+(aq) + 2e <=> H2(g) ........ Eº = 0.0V
Ni2+(aq) + 2e <=> Ni(s) ................ Eº = -0.25V