Cell potential

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manasa933
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am

Cell potential

Postby manasa933 » Tue Feb 27, 2018 7:26 pm

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.

Hubert Tang-1H
Posts: 44
Joined: Thu Jul 27, 2017 3:00 am

Re: Cell potential

Postby Hubert Tang-1H » Tue Feb 27, 2018 9:09 pm

I think that, if it's not specified, we would orient the reaction so that the potential is positive.

RohanGupta1G
Posts: 34
Joined: Sat Jul 22, 2017 3:00 am

Re: Cell potential

Postby RohanGupta1G » Thu Mar 01, 2018 8:30 am

Yeah i think when they are both negative you gotta just choose the one that is less negative for the cathode

Leanne Wong 1H
Posts: 50
Joined: Tue Oct 10, 2017 7:13 am
Been upvoted: 1 time

Re: Cell potential

Postby Leanne Wong 1H » Thu Mar 01, 2018 10:33 am

The best way to determine if something is an anode or cathode, you would look if the electrons are gained or lost.

SitharaMenon2B
Posts: 50
Joined: Thu Jul 27, 2017 3:01 am

Re: Cell potential

Postby SitharaMenon2B » Thu Mar 01, 2018 3:42 pm

Usually the pair with the more positive E° forms the cathode, and the less positive/more negative species forms the anode.

Manvir2K
Posts: 32
Joined: Fri Sep 29, 2017 7:05 am

Re: Cell potential

Postby Manvir2K » Thu Mar 01, 2018 4:02 pm

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.


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