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Redox Balance MnO4- + Br- = MnO2 + BrO3- || Oxidation Number Method
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This video explains redox balancing of reaction of permanganate ion with bromide ion in basic medium by Oxidation number method.
Steps to be followed
Step 1 – Assign oxidation number
Assign Oxidation number for Mn & Br. Oxidation number of Mn in MnO4- is +7 and in MnO2, its oxidation number is reduced to +4. This shows that permanganate ion is the Oxidant and Bromide ion is the reductant.
Step 2 –ION & DON
Segregate the reaction into ION( increase in Oxidation Number )& DON (Decrease in Oxidation number, Then do the following
1.Balance atoms other than Hydrogen& oxygen
2.Balance O.N
Once completing step 2, Rewrite the original redox reaction.
Step 3- Balance ionic charge by adding H+ for acidic medium & OH- for basic medium
As the reaction occurs in basic medium and the ionic charges are not equal on both sides add 2 OH- ions on the right to make ionic charges equal.
Step 4 – Balance Hydrogen atoms by adding H2O
To balance H- atoms, add 1 H2O molecule on the left side to get balanced redox change.
Step 5 – Check number of Oxygen atoms for final checking of answer
2MnO4-(aq) + Br-(aq) +H2O =2MnO2(s) + BrO3- (aq) + 2OH-(aq)
Steps to be followed
Step 1 – Assign oxidation number
Assign Oxidation number for Mn & Br. Oxidation number of Mn in MnO4- is +7 and in MnO2, its oxidation number is reduced to +4. This shows that permanganate ion is the Oxidant and Bromide ion is the reductant.
Step 2 –ION & DON
Segregate the reaction into ION( increase in Oxidation Number )& DON (Decrease in Oxidation number, Then do the following
1.Balance atoms other than Hydrogen& oxygen
2.Balance O.N
Once completing step 2, Rewrite the original redox reaction.
Step 3- Balance ionic charge by adding H+ for acidic medium & OH- for basic medium
As the reaction occurs in basic medium and the ionic charges are not equal on both sides add 2 OH- ions on the right to make ionic charges equal.
Step 4 – Balance Hydrogen atoms by adding H2O
To balance H- atoms, add 1 H2O molecule on the left side to get balanced redox change.
Step 5 – Check number of Oxygen atoms for final checking of answer
2MnO4-(aq) + Br-(aq) +H2O =2MnO2(s) + BrO3- (aq) + 2OH-(aq)
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