I can do it two ways. I'm not sure which way is right though. Here is way 1.
(If you dont make the oxygen into O2.)
Also I think you just confusing yourself. You dont need to add any OH.
This is how I would do it.
Equation: H2O2 ==> H2O +O
Charge: -1 ==> -2
Solution: add +1e- to the left hand side so the charges equal.
H2O2 +1e- ==> H2O + O
Equation:2H2O2 ==> 2H2O +O2
Charge: -2 0
Solution: add 2 electrons (+ 2e-) to the right and side.
Solution: 2H2O2 ==> H2O + O2 +2e-
I think the first way is right.
He's right. When you reduce H2O2 in basic solutions you have to add OH- to balance the equation.
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