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Topic: FINDING IT TOUGH TO BALANCE AN IONIC EQTN  (Read 6261 times)

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indianprince

  • Guest
FINDING IT TOUGH TO BALANCE AN IONIC EQTN
« 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?

Demotivator

  • Guest
Re:FINDING IT TOUGH TO BALANCE AN IONIC EQTN
« Reply #1 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
« Last Edit: December 13, 2004, 11:20:34 PM by Demotivator »

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