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223336 Sigma-Aldrich

Sodium tungstate dihydrate

ACS reagent, ≥99%

Synonym: Tungstic acid sodium salt dihydrate

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Properties

Related Categories Catalysis and Inorganic Chemistry, Chemical Synthesis, Essential Chemicals, Research Essentials, Salts,
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%
storage temp.   room temp
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.

Packaging

5, 100, 500 g in poly bottle

Safety & Documentation

Safety Information

Symbol 
GHS07  GHS07
Signal word 
Warning
Hazard statements 
Precautionary statements 
RIDADR 
NONH for all modes of transport
WGK Germany 
WGK 1
RTECS 
YO7900000
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable

Documents

Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles
Peer-Reviewed Papers
15

References

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