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Topic: Redox half-equations  (Read 3848 times)

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chemistrie

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Redox half-equations
« on: December 25, 2004, 09:20:52 PM »
I know that oxygen acr as a oxidising agent in redox reactions, there are 2 half equations for the chemical change of oxygen. One is O2(g) changes to 2 oxide ions. But the other one is O2(g) + 2H2O(l) + 4e is changed to 4 hydroxide ions, how does that happen? Can anyone give an example for that?
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Offline Donaldson Tan

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Re:Redox half-equations
« Reply #1 on: December 26, 2004, 06:23:39 PM »
half reactions can occur backwards too.

discharging of hydroxide ions to yield oxygen during electrolysis follows the reaction you mentioned:

4OH- => 2H2O + O2 + 4e
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