Anode and Cathode

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Andrea_Torres
Posts: 98
Joined: Sun Sep 15, 2019 12:15 am

Anode and Cathode

Postby Andrea_Torres » Sun Mar 01, 2020 5:08 pm

Are we given when a reaction is anode or cathode or are we supposed to be able to determine that by ourselves? If so, how do we determine which is which?

Amir Bayat
Posts: 115
Joined: Sat Sep 07, 2019 12:16 am

Re: Anode and Cathode

Postby Amir Bayat » Sun Mar 01, 2020 5:10 pm

If not given which is which, we can tell through whether half-reaction is reduced or oxidized. This can be told through the greater electric standard potential of the reaction, the greater or more positive standard electric potential is the reduction reaction and the other is the oxidation reaction. The reduction reactions take place at the cathode and the oxidation reactions take place at the anode.

Osvaldo SanchezF -1H
Posts: 122
Joined: Wed Sep 18, 2019 12:21 am

Re: Anode and Cathode

Postby Osvaldo SanchezF -1H » Sun Mar 01, 2020 5:13 pm

well in a cell diagram a cathode is termed to be to the right and an anode is termed to be to the left of a cell diagram, well usually. Best way to determine which reactions belongs where is to know that in the cathode reduction half reaction takes place and in an anode a roxidation half reaction takes place.

chrisleung-2J
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Re: Anode and Cathode

Postby chrisleung-2J » Sun Mar 01, 2020 5:39 pm

The reduction reaction always occurs at the cathode, and the oxidation reaction is the anode.

Abigail_Hagen2G
Posts: 107
Joined: Fri Aug 09, 2019 12:17 am

Re: Anode and Cathode

Postby Abigail_Hagen2G » Sun Mar 01, 2020 6:28 pm

If you're given a diagram, the left is the anode and the right it the cathode. If you aren't given a diagram, the greater electric potential is at the cathode.

DHavo_1E
Posts: 118
Joined: Sat Aug 17, 2019 12:17 am

Re: Anode and Cathode

Postby DHavo_1E » Sun Mar 01, 2020 7:03 pm

Abigail_Hagen2G wrote:If you're given a diagram, the left is the anode and the right it the cathode. If you aren't given a diagram, the greater electric potential is at the cathode.



Hi,

What do you mean by ‘greater’ electric potential? Thank you :)

KHowe_1D
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Re: Anode and Cathode

Postby KHowe_1D » Sun Mar 01, 2020 7:25 pm

You will need to be able to determine it yourself. The anode is oxidized and the cathode is reduced.

Elizabeth Bowen 1J
Posts: 53
Joined: Wed Nov 14, 2018 12:20 am

Re: Anode and Cathode

Postby Elizabeth Bowen 1J » Sun Mar 01, 2020 8:06 pm

We would have to determine it ourselves knowing that charge leaves the cathode and flows towards the anode.

AKhanna_3H
Posts: 104
Joined: Wed Sep 18, 2019 12:19 am

Re: Anode and Cathode

Postby AKhanna_3H » Sun Mar 01, 2020 8:09 pm

If not told, you can figure out which is which by calculating what would make the overall cell potential positive. You could find the individual cell potentials for each half reaction, and then determine which would make E(cathode) - E(anode) a positive value.


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