Synthesis of Sodium hypomanganate

A homogeneous mixture is prepared from 1.05 g of manganese dioxide and 1.4 g of sodium hydroxide, which is then placed in a beaker and heated at 300°C for 30 minutes. The mixture should be stirred from time to time.

2 MnO2 + 6 NaOH + 1/2 O2 = 2 Na3MnO4 + 3 H2O

Source

Heating the mixture

The product

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