Sodium manganate

Sodium manganate is the inorganic compound with the formula Na₂MnO₄. This is a deep green solid is rarely encountered analogue of the related salt K₂MnO₄. Sodium manganate is rarely encountered because it cannot be readily prepared from by the oxidation of manganese dioxide and sodium hydroxide. Instead this oxidation stops at the level of Na₃MnO₄, and this Mn(V) salt is unstable in solution. Sodium manganate can be produced by reduction of sodium permanganate under basic conditions.

4 NaOH + 4NaMnO₄ → 4 Na₂MnO₄ + 2 H₂O + O₂

Because Na₃MnO₄ is difficult to prepare, sodium permanganate is more expensive than potassium permanganate.

References

Sodium manganate
Read More