If acidic H2O2 is mixed with Fe^2+, which reaction occurs: the oxidation of Fe^2+ to Fe^3+...

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Chemistry

If acidic H2O2 is mixed with Fe^2+, which reaction occurs: theoxidation of Fe^2+ to Fe^3+ or the reduction of Fe^2+ to Fe? Givethe balanced redox reaction for each possibility and explain yourreason for selecting the reaction which will occur. Assume standardsolution concentrations.

For a) I have:

red: H2O2 + 2H+ + 2e- ---> 2 H2O E=+1.78 V

oxi Fe2+ ----> Fe3+ + e- E=-0.77V

Ecell = 1.01V

I'm stuck on b) but for the explanation I think I understandthat the one which is more positive is more thermodynamicallyfavoured, but if I'm wrong on this I'd appreciate a pointer in theright direction.

Answer & Explanation Solved by verified expert
4.2 Ratings (724 Votes)
red H2O2 2H 2e 2 H2O E178 V oxi Fe3 e Fe2 E077V TRUE the most positive is likely to reduce ie follow the reaction shown and the most negative is likely to xidizde reverse    See Answer
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