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1/2 reactions

Posted: Thu Feb 21, 2019 11:16 am
by TiffanyL1G
When we are writing out the 1/2 reactions, why do we always write our redox reactions as reductions and not oxidations? Is it possible to solve the same problem but with oxidations reactions?

Re: 1/2 reactions

Posted: Thu Feb 21, 2019 11:51 am
by klarratt2
We write them as reductions because the EMF (E°) values of the half reactions are given for the reduction of those cations. If you were to use the oxidation reaction, you would switch the sign of the E° value (ex: the E° for reduction is 0.76V so the E° for oxidation is -0.76V).