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Problem: When the reactionMnO4–(aq) + CN–(aq) → MnO2(s) + CNO–(aq)is balanced in a basic medium, what are the sum of the coefficients?A) 20B) 10C) 8D) 13E) 11

FREE Expert Solution

We are being asked to determine the are the sum of the coefficients when the reaction is balanced in a basic medium.


When balancing redox reactions under basic conditions, we will follow the following steps.

Step 1: Separate the whole reaction into half-reactions
Step 2: Balance the non-hydrogen and non-oxygen elements first
Step 3: Balance oxygen by adding H2O to the side that needs oxygen (1 O: 1 H2O)
Step 4: Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)
Step 5: Balance the charges: add electrons to the more positive side (or less negative side)
Step 6: Balance electrons on the two half-reactions
Step 7: Get the overall reaction by adding the two reaction
Step 8: Balance remaining H+ by adding an equal amount of OH- ions to both sides
Step 9: H+(aq) will combine with OH-(aq) to form H2O(l)­
Step 10: Cancel out common species.


Balance the redox reaction under basic condition:

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Problem Details

When the reaction

MnO4(aq) + CN(aq) → MnO2(s) + CNO(aq)

is balanced in a basic medium, what are the sum of the coefficients?

A) 20

B) 10

C) 8

D) 13

E) 11

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