MnO4^-+C2O4^2-+H^+=Co2+H2O+Mn^2+. The correct coefficients of MnO4^- C2O4^2- and H^+
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11th
Chemistry
Redox Reactions
Balancing Redox Reactions
For the redox reaction, MnO...
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Asked on October 15, 2019 by
Joshraj Pannerselvam
For the redox reaction, MnO
4
−
+C
2
O
4
2−
+H
+
→Mn
2+
+CO
2
+H
2
O, the correct coefficients of the reactants for the balanced equation are _____________.
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ANSWER
The unbalanced redox reaction is MnO
4
−
+C
2
O
4
2−
+H
+
→Mn
2+
+CO
2
+H
2
O
Balance C atoms.
MnO
4
−
+C
2
O
4
2−
+H
+
→Mn
2+
+2CO
2
+H
2
O
The oxidation number of Mn decreases from +7 to +2.
The decrease in the oxidation number is 7−2=5
The oxidation number of C increases from +3 to +4.
The increase in the oxidation number for 1 C atom is 4−3=1
The increase in the oxidation number for 2 C atom is 2×1=2
To balance the increase in the oxidation number with decrease in the oxidation number, multiply Mn containing species with 2 and C containing species with 5.
2MnO
4
−
+5C
2
O
4
2−
→2Mn
2+
+10CO
2
Balance O atoms by adding 8 water molecules to the products side.