Potassium manganate

Potassium manganate
Names
	IUPAC names Potassium manganate; Potassium manganate(VI)
Identifiers
CAS Number	10294-64-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	141385 ;
ECHA InfoCard	100.030.592
EC Number	233-665-2;
PubChem CID	160931;
UNII	5PI213D3US ;
CompTox Dashboard (EPA)	DTXSID10893107 ;
	InChI Key: XKYFHUXZPRFUTH-UHFFFAOYSA-N; InChI=1S/2K.Mn.4O/q2+1;;;;2-1;
	SMILES [O-][Mn](=O)(=O)[O-].[K+].[K+];
Properties
Chemical formula	K2MnO4
Molar mass	197.132 g/mol
Appearance	green crystals (darkening with time)
Density	2.78 g/cm3, solid
Melting point	190 °C (374 °F; 463 K) (decomposition)
Solubility in water	decomposes
Acidity (pKa)	7.1
Structure
Crystal structure	isomorphous with K2SO4
Coordination geometry	tetrahedral anion
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	oxidizer
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H272, H315, H319, H335
Precautionary statements	P210, P220, P221, P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P370+P378, P403+P233, P405, P501
NFPA 704 (fire diamond)	1 0 1 OX
Related compounds
Related compounds	Potassium permanganate; Manganese dioxide; Potassium chromate; Potassium ferrate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Potassium manganate is the inorganic compound with the formula K₂MnO₄. This green-colored salt is an intermediate in the industrial synthesis of potassium permanganate (KMnO₄), a common chemical. Occasionally, potassium manganate and potassium permanganate are confused, but each compound's properties are distinct.

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