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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: indianprince on December 11, 2004, 06:49:33 AM

Title: FINDING IT TOUGH TO BALANCE AN IONIC EQTN
Post by: indianprince on December 11, 2004, 06:49:33 AM

My Chem Sir gave me a real toughie of a problem....
This is the question:
Balance the reaction in basic medium..
CrI3  +  H2O2 +  OH-   ------>   (CrO4)2-  +  (IO4)-  + H20

I got these things clear:
Cromium is oxidised from +3 oxidation state to +6 oxidation state
Iodine is also oxidised from -1 to +7 oxidation state
Hydrogen Peroxide is reduced to Water

I dont know how to proceed as since there are two oxidation half reactions and one reduction reaction.. ??? :'(

Any help on this prob will be greatly appreciated. :)
and how to solve such similar probs when more than a single oxidation or red reaction is taking place?

Title: Re:FINDING IT TOUGH TO BALANCE AN IONIC EQTN
Post by: Demotivator on December 13, 2004, 11:19:03 PM

Nothing prevents you from including both oxidations into one half reaction:

CrI3 +  OH- ->  (CrO4)2-  +  (IO4)-  + H20    (unbalanced)

H2O2  -->  OH-    unbalanced