Sodium manganate

Identifiers
CAS Number	15702-33-7
3D model (JSmol)	Interactive image
PubChem CID	22558567
InChI InChI=1S/Mn.2Na.4O/q;2*+1;;;2*-1 Key: BNBLBRISEAQIHU-UHFFFAOYSA-N
SMILES [O-] [Mn](=O)(=O)[O-].[Na+].[Na+]
Properties
Chemical formula	MnNa2O4
Molar mass	164.914 g·mol−1
Appearance	deep green solid
Related compounds
Related compounds	Barium manganate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Sodium manganate is the inorganic compound with the formula Na₂Mn O₄. This deep green solid is a rarely encountered analogue of the related salt K₂MnO₄. Sodium manganate is rare because it cannot be readily prepared from the oxidation of manganese dioxide and sodium hydroxide. Instead this oxidation reaction tends to stop at producing sodium hypomanganate, Na₃MnO₄, and even this Mn(V) salt is unstable in solution.^[1] Sodium manganate can be produced by reduction of sodium permanganate under basic conditions:

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

Because NaMnO₄ is difficult to prepare, sodium permanganate is more expensive than potassium permanganate.