Would some one please provide a step by step evaluation forthe following redox I

Question

Would some one please provide a step by step evaluation forthe following redox I am stuck on,    ClO3- + Cl- --> Cl2+ ClO2 (in acidic solution). Thank you! Would some one please provide a step by step evaluation forthe following redox I am stuck on,    ClO3- + Cl- --> Cl2+ ClO2 (in acidic solution). Thank you!

Explanation / Answer

ClO3-   -> ClO2        ClO3- has Cl with +5, ClO2 has Cl with+4 (O has -2 charge), so this is the reduction (by 1 e-) ClO3- + e- -> ClO2       balance O withH2O ClO3- + e-   ->   ClO2 +H2O      balance H with H+ ClO3- + 2H+ +e-   -> ClO2 + H2O Cl-   ->Cl2               balance Cl 2Cl-   ->Cl2             Cl- has -1 charge. Cl2 has 0 charge. Since there are 2 Cl-,you oxidize Cl- by 2 e- 2Cl-   -> Cl2 + 2e- Add both bolded equation; multiply the first by 2, so thatelectrons are eliminated (ClO3- + 2H+ +e-   -> ClO2 +H2O)*2     2Cl-                      -> Cl2 +2e-                                              2ClO3-   + 4H+ +2Cl-   -> 2ClO2 +2H2O + Cl2

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