Half-Reactions

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edith_escalante_3G
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm

Half-Reactions

Postby edith_escalante_3G » Wed Feb 08, 2017 10:32 pm

Hi, I just needed a clarification on half-reactions and the difference between oxidation and reduction half-reactions. It would really be helpful to know how to combine them to produce a balanced redox reaction.

Thank you in advance!

Chem_Mod
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Re: Half-Reactions

Postby Chem_Mod » Wed Feb 08, 2017 11:47 pm

Firstly write down correct balanced half reactions. Then multiply each half reaction by a constant to balance number of electrons. Finally add two half reactions together and, if the reactions are in aqueous solution, balance H or O by adding OH- or H+ (determined by pH value) to one side and H2O to the other side.

paulapedrani
Posts: 27
Joined: Wed Sep 21, 2016 2:56 pm

Re: Half-Reactions

Postby paulapedrani » Wed Feb 08, 2017 11:50 pm

Make sure to also flip or "reverse" the equation when needed! If you're finding E, remember that when you multiply the equation to get the same number of moles, you DO NOT multiply E like we did in Hess's law. We just switch the sign if we reverse the equation.


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