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April 21, 2015

Homework Help: CHemistry- MIDTERM TODAY PLEASE HELP

Posted by Sara on Friday, October 17, 2008 at 8:08am.

Hey i have a question regarding disproportionate reactions:

Permanganate ions MnO4 reacts with oxalic acid, H2C2O4 in acidic aqueous solution, producing manganese(II) ions and carbon dioxide. The skeletal equation is

MnO4^-(aq)+ H2C2O4(aq)--> Mn^2+(aq)+ Co2 (g)

balance this reaction in acidic solution

So first i write down the 2 half reactions, and balance them

MnO4^-(aq)+ 8H^+ --> Mn^2+(aq)+ 4H2O

and

H2C2O4(aq)+ 2H^+ --> Co2(g)+ 2H20

I know i have to determine the electron charges, this is where i am sure what to do, i am getting confused as to how to add up the electron charges on each side , i know that i have to to that in both the half reaction and cancel them out and get the net ionic equation...can someone please help me understand the electron charges part:

I think MnO4 is oxidizing here, and H2C2O4 is reducing

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