72069

Sigma-Aldrich

Sodium tungstate dihydrate

BioUltra, ≥99.0% (T)

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.25

product line

BioUltra

Quality Level

assay

≥99.0% (T)

impurities

insoluble matter, passes filter test
≤0.001% total nitrogen (N)
≤0.1% free alkali (as NaOH)

pH

9.5-11.5 (25 °C, 1 M in H2O)

mp

698 °C (lit.)

solubility

H2O: 1 M at 20 °C, clear, colorless

anion traces

chloride (Cl-): ≤50 mg/kg
sulfate (SO42-): ≤100 mg/kg

cation traces

As: ≤0.5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤50 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Ni: ≤5 mg/kg
Pb: ≤10 mg/kg
Zn: ≤5 mg/kg

λ

1 M in H2O

UV absorption

λ: 260 nm Amax: ≤0.120
λ: 280 nm Amax: ≤0.035

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 sodium salt of tungstic acid, which occurs as white colorless crystals.

Application

Sodium tungstate dihydrate has been used in bioluminescence assays and to synthesize polycrystalline samples.

Other Notes

Stain in electron microscopy (nucleic acids, certain glycoproteins); Protein precipitant.

Pictograms

Exclamation mark

Signal Word

Warning

Hazard 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

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Handbook of Inorganic Compounds (2016)
Gardner's Commercially Important Chemicals: Synonyms, Trade Names, and Properties (2005)
Structural, vibrational and luminescence properties of the (1- x) CaWO4- xCdWO4 system
Taoufyq A, et al.
Journal of Solid State Chemistry, 219, 127-137 (2014)
J.C. Stockert
Biology of the Cell, 29, 211-211 (1977)
R.M.C. Dawson, et al.
Data for Biochemical Research, 549-549 (1986)

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