Question

Determine the number of water molecules necessary to balance the reduction half reaction of ___ MnO4-(aq)...

Determine the number of water molecules necessary to balance the reduction half reaction of

___ MnO4-(aq) → ___ MnO2(s) that occurs in a basic solution.

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Homework Answers

Answer #1

Mn in MnO4- has oxidation state of +7

Mn in MnO2 has oxidation state of +4

So, Mn in MnO4- is reduced to MnO2

MnO4- + 3e- --> MnO2

Balance Oxygen by adding water

MnO4- + 3e---> MnO2 + 2 H2O

Balance Hydrogen by adding H+

MnO4- + 4 H+ + 3e- --> MnO2 + 2 H2O

Add equal number of OH- on both sides as the number of H+

MnO4- + 4 H+ + 4 OH- + 3e- --> MnO2 + 2 H2O + 4 OH-

Combine H+ and OH- to form water

MnO4- + 4 H2O + 3e- --> MnO2 + 2 H2O + 4 OH-

Remove common H2O from both sides

Balanced Eqn is

MnO4- + 2 H2O + 3e- --> MnO2 + 4 OH-

This is balanced chemical equation in basic medium

Answer:

MnO4- + 2 H2O + 3e- --> MnO2 + 4 OH-

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