(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Write the half equation for the cathodic reaction of oxygen

3. The attempt at a solution

Now I know that the cathodic reaction will be reduction and so the oxygen will be gaining electrons. I thought I had the answer from the lecture notes, but then I thought of another possible equation that would work too and I don't know which one is right??

The two equations are as follows:

equation from notes( the notes say that this is the most common)

[tex]O_2 + 2H_2O + 4e^- ->4OH^-[/tex]

the equation I came up with

[tex]O_2 + 4H^+ + 4e^- ->2H_2O[/tex]

Are these just two possible half equations for the cathodic reaction of oxygen or is one wrong??

Thanks for your time

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# Homework Help: Redox equations

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