钨酸钠

Description

Sodium Tungstate · CAS 13472-45-2 · Na2O4W. UNII 64LRH4405G. Melting Point: 698 °C; Melting Point: 695 °C; Solubility: SOL 57.5 G/100 CC WATER @ 0 °C; 73.2 G @ 21 °C; 96.9 G @ 100 °C.

Identification

CAS Registry Number	13472-45-2
PubChem CID	26052
Molecular formula	Na2O4W
IUPAC name	disodium;dioxido(dioxo)tungsten
UNII (FDA)	64LRH4405G

Computed Descriptors

Molecular Weight	293.82
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	293.910130
Monoisotopic Mass	293.910130
Topological Polar Surface Area	80.3
Heavy Atom Count	7
Formal Charge	0
Complexity	62.2

Physical & Chemical Properties

Melting Point	698 °C
Melting Point	695 °C
Solubility	SOL 57.5 G/100 CC WATER @ 0 °C; 73.2 G @ 21 °C; 96.9 G @ 100 °C
Density	4.179
Density	4.179 @25 °C

Physical description & handling notes

• Liquid
• White solid; [HSDB] White powder; [MSDSonline] Soluble in water; [Hawley]
• WHITE, RHOMBIC
• White crystalline powder or granules
• Colorless crystals or white crystalline powder; loses its water @ 100 °C; aq soln is slightly alkaline, pH 8-9; effloresces in dry air; sol in about 1.1 parts water; insol in alc /Dihydrate/
• SLIGHTLY SOL IN AMMONIA; INSOL IN ACID /DIHYDRATE/

GHS Hazard Classification

Reported hazard statements	H302 (100%), H320

Documented Uses

• Used to make fire and water resistant fabrics, metallic tungsten, and other tungsten compounds; Also used as a biological reagent, a precipitant for alkaloids, and a catalyst for the oxidation of maleic acid; [HSDB]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]
• Fireproofing and waterproofing fabrics; preparing complex compd, such as phosphotungstate, silicotungstate; as a reagent for biological products; precipitant for alkaloids
• CHEM INT FOR METALLIC TUNGSTEN & TUNGSTEN COMPOUNDS; CHEM INT FOR PHOSPHOTUNGSTIC ACID, A DYE COMPONENT; COMPONENT OF NON- & SEMI-DURABLE TEXTILE FLAME RETARDANTS
• Flame retardant textile treatment agent
• Catalyst used in the oxidation of maleic acid

Synonyms

SODIUM TUNGSTATE; 13472-45-2; Disodium tungstate; Sodium tungstate(VI); Sodium wolframate; Sodium tungsten oxide (Na2WO4); Sodium tungstate (Na2WO4); Tungstic acid, disodium salt; Disodium tungstate (Na2WO4); CCRIS 5814; Sodium tungstate (Na2(WO4)); Disodium tetraoxatungstate (2-); Disodium tetraoxotungstate (2-); HSDB 5057; Sodium tungstate(VI) (Na2WO4); EINECS 236-743-4

Frequently Asked Questions

What are the CAS number and molecular formula of Sodium Tungstate?

CAS 13472-45-2; molecular formula Na2O4W; molecular weight — g/mol.

What other names is Sodium Tungstate known by?

SODIUM TUNGSTATE, 13472-45-2, Disodium tungstate, Sodium tungstate(VI), Sodium wolframate, Sodium tungsten oxide (Na2WO4).

Is Sodium Tungstate classified as hazardous?

Hazard statements reported: H302, H320.

What are the key physical properties of Sodium Tungstate?

Melting Point: 698 °C; Melting Point: 695 °C; Solubility: SOL 57.5 G/100 CC WATER @ 0 °C; 73.2 G @ 21 °C; 96.9 G @ 100 °C; Density: 4.179.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.