Anode vs Cathode and their Equations

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Yang Chen 2E
Posts: 36
Joined: Thu Jul 13, 2017 3:00 am

Anode vs Cathode and their Equations

Postby Yang Chen 2E » Mon Feb 19, 2018 8:36 pm

Just to be clear, given two half equations, the Cathode consists of the more electronegative atom right? Also, for all of the half equations, are the E(cathode)/E(anode) values flipped if we were to flip the sign of the equation?

Ryan Sydney Beyer 2B
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Joined: Fri Sep 29, 2017 7:07 am
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Re: Anode vs Cathode and their Equations

Postby Ryan Sydney Beyer 2B » Tue Feb 20, 2018 10:20 am

The cathode equations should have a more positive value of standard potential then the anode half reactions. This makes sense because when you go to determine the standard cell potential then you will arrive at the most energetically favorable number.

Justin Lai 1C
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: Anode vs Cathode and their Equations

Postby Justin Lai 1C » Tue Feb 20, 2018 11:27 am

The anode has the element that is most likely oxidized while the cathode has the element that is reduced. The half-reaction with the element that is most likely reduced has a higher standard potential (more V) so it forms the cathode. The half-reaction with the element that is less likely reduced has a lower standard potential and that forms the anode. A half-reaction that is a reduction equation can be flipped to form an oxidation equation, also flipping the standard potential as well.


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