In the laboratory, manganese(II) salt is oxidized to permanganate ion in aqueous solution by

In laboratory, potassium permanganate is prepared by oxidizing a manganese (II) ion salt by peroxodisulphate.

$2{\mathrm{Mn}}^{2+}+\underset{\mathrm{peroxodisulphate} \mathrm{ion}}{ {\mathrm{S}}_2{\mathrm{O}}_8^{2-}+ 8{\mathrm{H}}_2}\mathrm{O}\to 2{\mathrm{MnO}}_4^{-}+10{\mathrm{SO}}_4^{2-}+16{\mathrm{H}}^{+}$