Question

how to prepare K2MnO4 from MnO2?

Answer 1

K2MnO4 can be prepared from MnO2 by adding 4 moles of KOH to MnO2 . The reaction is as follows 2MnO2 + 4KOH + O2 -----> K2MnO4 + 2H2O

Answer 2

Preparation of $K_2 MnO_4$  from $MnO_2$

• To prepare $K_2 MnO_4$ (potassium permanganate) from $MnO_2$ (magnesium oxide), four molecules of caustic potash should be added (KOH) in the presence of oxygen.  

• The reaction is expressed below: $2 \mathrm{MnO}_{2}+4 \mathrm{KOH}+\mathrm{O}_{2} \rightarrow \mathrm{K}_{2} \mathrm{MnO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$

• In simple terms, the reaction can be expressed as:  Two molecules of magnesium oxide react with four molecules of potassium hydroxide in the presence of air to create one molecule of potassium permanganate and two molecules of water.

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