Give the commercial method for the preparation of KMnO4.

Asked by Topperlearning User | 27th Jun, 2014, 09:08: AM

Expert Answer:

Ist step: Fusion of MnO2 with an alkali metal hydroxide and an oxidising agent like KNO3.

2MnO2 + 4KOH + O2    2K2MnO4 + 2 H2O
IInd step:
3MnO4 2– + 4H+ →  2MnO4 + MnO2 + 2H2O

Commercially it is prepared by the Electrolytic oxidation of manganate(VI).
MnO42-   MnO4-
Manganate                               Permanganate 

Answered by  | 27th Jun, 2014, 11:08: AM