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72069

Sigma-Aldrich

Sodium tungstate dihydrate

BioUltra, ≥99.0% (T)

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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

Assay

≥99.0% (T)

form

crystals

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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This Item
2233363797511.06673
Sodium tungstate dihydrate BioUltra, ≥99.0% (T)

Sigma-Aldrich

72069

Sodium tungstate dihydrate

Premium Grade
Sodium tungstate dihydrate for analysis EMSURE®

Supelco

1.06673

Sodium tungstate dihydrate

-
form

crystals

form

crystalline powder

form

chunks

form

crystals

impurities

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

impurities

≤0.01% insolubles, ≤0.02 meq/g Titr. free base

impurities

-

impurities

-

pH

9.5-11.5 (25 °C, 1 M in H2O)

pH

9-11.5 (20 °C, 100 g/L)

pH

-

pH

8-9 (20 °C, 50 g/L in H2O)

mp

698 °C (lit.)

mp

698 °C (lit.)

mp

698 °C (lit.)

mp

100 °C (Elimination of water of crystallisation)

solubility

H2O: 1 M at 20 °C, clear, colorless

solubility

-

solubility

-

solubility

730 g/L

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

Precautionary Statements

Hazard Classifications

Acute Tox. 4 Oral

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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R.M.C. Dawson, et al.
Data for Biochemical Research, 549-549 (1986)
Iron is involved in maintenance of circadian period length in Arabidopsis
Chen YY, et al.
Plant Physiology, pp-112 (2013)
J.C. Stockert
Biology of the Cell, 29, 211-211 (1977)
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