Question

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










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Answer 1

Answer:

Permanganate ion reacts with bromide ion in the basic medium to give manganese dioxide and bromate ion. The balanced reaction is 2MnO−4+Br−+H2O→2MnO2+BrO−3+2OH−.

Answer 2

Answer:

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+4H2O

Thus, reaction can be balanced