Question

# Permanganate ion reacts with bromide ion in basic medium to give magnesium dioxide and bromate ion.Write the balanced ionic equation for the reaction.

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Solution

## 1)2MnO4−(aq)+Br−(aq)+H2O(l)⟶2MnO2(s)+BrO3(aq)+2OH−(aq)Here, instead of solving the overall reaction we solve as half reactions. The two half reactions occurring here are written as:Br−+3H2O⟶BrO3−+6H++6e− -----(Oxidation)MnO4−+4H++3e−→MnO2+2H2O----- (Reduction)As in the reduction reaction no. of e- involved is half that of the one in the oxidation we will multiply the reaction by 2 so it becomes 2MnO4−+8H++6e−⟶2MnO2+4H2OThus, reaction can be balanced.

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