Wednesday
September 17, 2014

Homework Help: General Chemistry

Posted by Emily on Wednesday, April 3, 2013 at 3:53pm.

Balance the following redox reaction in acidic and basic solutions:

Fe(OH)2(s) + O2(g) --> Fe(OH)3(s)

These are the steps my instructor gave us to balance redox reactions:
1. Divide into 1/2 rxns (reduction & oxidation)
2. Balance atoms other than H & O
3. Balance O with H2O
4. Balance H with H+
5. Balance charge by adding e-
6. Equalize # of e- and add reactions
-- in basic soln --
7. Balance H+ by adding OH-

I only included the steps she gave us because everyone seems to have a different way of balancing these reactions. My problem with this reaction though is just plain writing the half reactions! I have a feeling that the oxidation reaction is Fe2+ --> Fe3+, but I am not sure how to write the reduction reaction. Any help is greatly appreciated!

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