Standard reduction potential (E)

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Michelle_Ahn_2N
Posts: 10
Joined: Wed Sep 21, 2016 2:58 pm

Standard reduction potential (E)

Postby Michelle_Ahn_2N » Fri Feb 03, 2017 7:09 pm

I have a question on standard reduction potential (E) value.
For half reactions, is E value always positive for cathode and negative for anode? or does it vary
depending on the situations?

Thanks in advance for your help!

Preston_Dang_1B
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

Re: Standard reduction potential (E)

Postby Preston_Dang_1B » Fri Feb 03, 2017 11:37 pm

It'll vary depending on the situation. The cathode/anode of a reaction depends whether or not the elements in a reaction are reduced or oxidized, respectively. It's not always a given that the cathode half-reaction will be positive and the anode negative.

Tycho_Meimban_2B
Posts: 31
Joined: Wed Sep 21, 2016 2:57 pm

Re: Standard reduction potential (E)

Postby Tycho_Meimban_2B » Sat Feb 04, 2017 1:28 am

For half reactions, the "E" value is based upon which element is being reduced and which element is being oxidized. Although the general trend is that the cathode will be positive, while the anode will be negative, this is due to the elements in the reaction. So, you can really say that it depends on the elements in the reaction.

Hope this helps!


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