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Balance the equation using the smallest whole numbers for the coefficients, assu

ID: 750913 • Letter: B

Question

Balance the equation using the smallest whole numbers for the coefficients, assuming the redox reaction occurs in basic solution. Add water where appropriate. CN-(aq) + MnO4-(aq) --> CNO-(aq) + MnO2(s) For my answer I got MnO4-(aq) + 2CN-(aq) --> MnO2(s) + 2CNO-(aq) Please help me understand what I have done wrong.

Explanation / Answer

CN-(aq) + MnO4-(aq) --> CNO-(aq) + MnO2(s) 3(H2O(l) + CN-(aq) --> CNO-(aq) + 2H+(aq) + 2e-) 2(3e- + 4H+(aq) + MnO4-(aq) --> MnO2(s) + 2H2O(l)) 4H2O(l) + 2MnO42-(aq) +3CN-(aq)--> 3CNO- + 2MnO2(s) + 8OH-(aq)

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