The $\mathrm{Mn}^{3+}$ ion is unstable in solution and undergoes disproportionation to give $\mathrm{Mn}^{2+}, \mathrm{MnO}_{2}$, and $\mathrm{H}^{+}$ion. Write a balanced ionic equation for the reaction.
The given reaction can be represented as:
The oxidation half equation is:
The oxidation number is balanced by adding one electron as:
The charge is balanced by adding 4H+ ions as:
The O atoms and H+ ions are balanced by adding 2H2O molecules as:
The reduction half equation is:
The oxidation number is balanced by adding one electron as:
The balanced chemical equation can be obtained by adding equation (i) and (ii) as:
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