223336

Sodium tungstate dihydrate

ACS reagent, ≥99%

• Synonym(s): Tungstic acid sodium salt dihydrate
• Linear Formula: Na₂WO₄ · 2H₂O
• CAS Number: 10213-10-2
• Molecular Weight: 329.85
• EC Number: 236-743-4
• MDL number: MFCD00149190
• UNSPSC Code: 12352302
• PubChem Substance ID: 329752303
• NACRES: NA.21

Properties

• grade: ACS reagent
• assay: ≥99%
• form: crystalline powder
• reaction suitability: reagent type: catalyst; core: tungsten
• impurities: ≤0.01% insolubles; ≤0.02 meq/g Titr. free base
• pH: 9-11.5 (20 °C, 100 g/L)
• mp: 698 °C (lit.)
• anion traces: chloride (Cl^-): ≤0.005%; sulfate (SO₄^2-): ≤0.01%
• cation traces: Mo: ≤0.001%; heavy metals and iron (as Pb): ≤0.001%
• SMILES string: O.O.[Na+].[Na+].[O-][W]([O-])(=O)=O
• InChI: 1S/2Na.2H2O.4O.W/h;;2*1H2;;;;;/q2*+1;;;;;2*-1;
• InChI key: WPZFLQRLSGVIAA-UHFFFAOYSA-N

Description

General description

Sodium tungstate dihydrate is a hydrated sodium salt of tungstic acid. It participates as a catalyst in the preparation of various epoxides. Various crystallographic properties of sodium tungstate dihydrate have been analyzed.

Application

Combines with hydrogen peroxide for the oxidation of secondary amines to nitrones.

Sodium tungstate dihydrate (Na₂WO₄.2H₂O) may be employed in the following studies:

• As a derivatization reagent for the determination of hydrogen peroxide by a fluorimetric method.
• Synthesis of N-hydroxy-desferrioxamine B, a metabolite of the microbial product desferrioxamine B.
• Preparation of highly crystalline CaMoO₄, SrMoO₄, CaWO₄ and SrWO₄ nanoparticles.

Sodium tungstate dihydrate may be used in the preparation of aqueous sols of tungsten oxide dihydrate.

Safety Information

• pictograms: GHS07
• signalword: Warning
• hcodes: H302
• pcodes: P264 - P270 - P301 + P312 - P501
• Hazard Classifications: Acute Tox. 4 Oral
• Storage Class: 13 - Non Combustible Solids
• wgk_germany: WGK 2
• flash_point_f: Not applicable
• flash_point_c: Not applicable