Sodium tungstate

Sodium tungstate
Names
	IUPAC name Sodium tungstate
Identifiers
CAS Number	13472-45-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	24266;
ECHA InfoCard	100.033.389
EC Number	236-743-4;
PubChem CID	26052;
RTECS number	YO7875000;
UNII	64LRH4405G ;
CompTox Dashboard (EPA)	DTXSID4021420 ;
	InChI Key: XMVONEAAOPAGAO-UHFFFAOYSA-N; InChI=1S/2Na.4O.W/q2+1;;;2-1;;
	SMILES [O-][W](=O)(=O)[O-].[Na+].[Na+];
Properties
Chemical formula	Na2WO4
Molar mass	293.82 g/mol (anhydrous); 329.85 g/mol (dihydrate)
Appearance	White rhombohedral crystals
Density	4.179 g/cm3 (anhydrous) ; 3.25 g/cm3 (dihydrate)
Melting point	698 °C (1,288 °F; 971 K)
Solubility in water	57.5 g/100 mL (0 °C) ; 74.2 g/100 mL (25 °C) ; 96.9 g/100 mL (100 °C)
Solubility	slightly soluble in ammonia ; insoluble in alcohol, acid
Structure
Crystal structure	Rhombic (anhydrous) ; orthorhombic (dihydrate)
Hazards
	GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H302
Precautionary statements	P264, P270, P301+P317, P330, P501
Safety data sheet (SDS)	External MSDS
Related compounds
Other cations	Lithium tungstate; Caesium tungstate
	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

Sodium tungstate is the inorganic compound with the formula Na₂WO₄. This white, water-soluble solid is the sodium salt of tungstic acid. It is useful as a source of tungsten for chemical synthesis. It is an intermediate in the conversion of tungsten ores to the metal.