223336

Sigma-Aldrich

Sodium tungstate dihydrate

ACS reagent, ≥99%

Synonym(s):
Tungstic acid sodium salt dihydrate
Linear Formula:
Na2WO4 · 2H2O
CAS Number:
Molecular Weight:
329.85
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

Quality Level

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 (SO42-): ≤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

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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

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

Packaging

5, 100, 500 g in poly bottle

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Precautionary Statements

hazcat

Acute Tox. 4 Oral

storage_class_code

13 - Non Combustible Solids

WGK Germany

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

B E Roggo et al.
The Journal of antibiotics, 46(2), 294-299 (1993-02-01)
N-Hydroxy-desferrioxamine B (5), a postulated metabolite of the microbial product desferrioxamine B (1), has been prepared by reduction of the intermediate oxime 6 with sodium cyanoborohydride. The oxime was obtained by selective oxidation of desferrioxamine B with hydrogen peroxide and...
Preparation of aqueous sols of tungsten oxide dihydrate from sodium tungstate by an ion-exchange method.
Choi YG, et al.
Sensors and Actuators B, Chemical, 87(1), 63-72 (2002)
Lattice constants and space group of sodium tungstate dihydrate.
Pistorius CWFT and Sharp WE.
Acta Crystallographica, 14(3), 316-317 (1961)
Reactions of hydrogen peroxide. IV. Sodium tungstate catalyzed epoxidation of α, β-unsaturated acids.
Payne GB and Williams PH.
The Journal of Organic Chemistry, 24(1), 54-55 (1959)
Journal of the Chemical Society. Chemical Communications, 874-874 (1984)

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