Posted by **Eddy** on Wednesday, March 23, 2011 at 2:42pm.

The redox reaction:

O3SOOSO3^2− + Cr^3+ -> HSO4^− + Cr2O7^2−

is carried out in aqueous acidic solution. Which elements are undergoing changes in oxidation state?

I thought it would be S and Cr. For the balanced equation, I got 3O3SOOSO3+Cr^3+ + 13H^+ -> 3HSO4^- + Cr2O7^2- + 5H2O , but it's wrong and I don't know what I did. Thanks in advance.

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