Make Potassium manganate K2MnO4 (Thermal decomposition of KMnO4)

Happy New year 2012, fellow chemists !

Today we will be making Potassium manganate, K2MnO4 from decomposing Potassium permanganate, KMnO4 - by exposing it to light.

When decomposing it, Oxygen gas is being produced. To prove it, light a wooden stick and put it in the testtube.

2 KMnO4 ==) K2MnO4 + MnO2 + O2

You have to keep the product in a basic solution, such as a solution of Sodium hydroxide - NaOH. You can´t use water for this, otherwise it will convert back to KMnO4.

3 K2MnO4 + 2 H2O → 2 KMnO4 + MnO2 + 4 KOH

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