Half-reactions

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Jasmine Botello 2F
Posts: 67
Joined: Fri Sep 29, 2017 7:04 am

Half-reactions

Postby Jasmine Botello 2F » Mon Mar 12, 2018 10:27 am

Are we always supposed to flip one of the half-reactions to give you the MOST positive E value?

K Stefanescu 2I
Posts: 68
Joined: Fri Sep 29, 2017 7:04 am

Re: Half-reactions

Postby K Stefanescu 2I » Mon Mar 12, 2018 10:31 am

In most cases, yes. Just focus on flipping the reactions so you have the correct overall reaction equation (one half-reaction must be a reduction, the other an oxidation, and when added together, they must be equivalent to the original reaction).

Kailey Brodeur 1J
Posts: 34
Joined: Thu Jul 27, 2017 3:00 am

Re: Half-reactions

Postby Kailey Brodeur 1J » Mon Mar 12, 2018 10:39 am

In addition to what was said above, make sure when you add the two half reactions together the electrons cancel out. This helps on the idea of flipping reactions because in one half reaction the electrons must be on the reactant side and in the other half reaction the electrons must be on the product side.

Sirajbir Sodhi 2K
Posts: 47
Joined: Sat Jul 22, 2017 3:00 am

Re: Half-reactions

Postby Sirajbir Sodhi 2K » Mon Mar 12, 2018 10:40 am

This is only true in a GALVANIC CELL - where the chemical reaction is spontaneous. In an electrolytic cell, this is not what we would do (we'd actually do the opposite I'm quite sure), because the reaction is non-spontaneous.

204932558
Posts: 23
Joined: Fri Sep 29, 2017 7:05 am

Re: Half-reactions

Postby 204932558 » Wed Mar 14, 2018 10:38 am

Yes. Just make sure the electrons cancel out, and that the reaction with a more negative reduction potential is one being flipped.


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