Page 1 of 1

Cell potential

Posted: Tue Feb 27, 2018 7:26 pm
by manasa933
When trying to figure whether a redox couple forms the anode or cathode, do we first like for sign or whether electrons are consumed or given off?

There were some examples in the textbook in which, though the sign was negative, the redox couple formed the cathode.

Re: Cell potential

Posted: Tue Feb 27, 2018 9:09 pm
by Hubert Tang-1H
I think that, if it's not specified, we would orient the reaction so that the potential is positive.

Re: Cell potential

Posted: Thu Mar 01, 2018 8:30 am
by RohanGupta1G
Yeah i think when they are both negative you gotta just choose the one that is less negative for the cathode

Re: Cell potential

Posted: Thu Mar 01, 2018 10:33 am
by Leanne Wong 1H
The best way to determine if something is an anode or cathode, you would look if the electrons are gained or lost.

Re: Cell potential

Posted: Thu Mar 01, 2018 3:42 pm
by SitharaMenon2B
Usually the pair with the more positive E° forms the cathode, and the less positive/more negative species forms the anode.

Re: Cell potential

Posted: Thu Mar 01, 2018 4:02 pm
by Manvir2K
If it is a galvanic cell, the more positive E° will be the cathode, and the less positive will be the anode since that is the only way for the cell to be spontaneous.