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Merck
CN

95420

Tungstic acid

≥98.0% (calcined substance, T), powder

Synonym(s):

Tungstic(VI) acid

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About This Item

Linear Formula:
H2WO4
CAS Number:
7783-03-1
Molecular Weight:
249.85
NACRES:
NA.23
PubChem Substance ID:
57653679
UNSPSC Code:
12352300
EC Number:
231-975-2
MDL number:
MFCD00011336
Assay:
≥98.0% (calcined substance, T)
Form:
powder

Key Documents

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Product Name

Tungstic acid, ≥98.0% (calcined substance, T), powder

form

powder

InChI key

CMPGARWFYBADJI-UHFFFAOYSA-L

InChI

1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2

SMILES string

O[W](O)(=O)=O

assay

≥98.0% (calcined substance, T)

impurities

≤0.2% insoluble matter in NaOH

loss

≤9.0% loss on ignition

density

5.5 g/mL at 25 °C (lit.)

Quality Level

200

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General description

Tungstic acid may be prepared by either digesting tungstate of lime or by treating tungsten with hydrochloric acid. 1

pictograms

Exclamation mark
GHS07

signalword

Warning

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Storage Class

13 - Non Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
BCCK6397
BCCJ1263
BCCB9450
BCBV1300
BCBQ9787V

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Multiple reversible protonation of polyoxoanion surfaces: direct observation of dynamic structural effects from proton transfer.
Xikui Fang et al.
Angewandte Chemie (International ed. in English), 46(21), 3877-3880 (2007-04-20)
Laura Barrio et al.
The journal of physical chemistry. A, 111(11), 2166-2171 (2007-03-29)
The catalytic system formed by tungstic acid and its complexes with H2O2 and phenylphosphonic acid has been analyzed from the experimental and theoretical points of view. Previous structural studies by XRD proved the validity of the DFT proposed models and
Shaopu Liu et al.
Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 19(7), 1055-1060 (2003-07-26)
In a weak acid medium, when an isopoly-tungstic acid reacts with berberine to form an ion-association complex, strong resonance Rayleigh scattering (RRS) appears and obvious frequency-doubling scattering (FDS) as well as second-order scattering (SOS) come into being. The scattering peaks
Thierry Barré et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 61(4), 551-557 (2005-01-15)
This study is focused on the composition and the evolution of tungstate ions solutions as a function of pH and increasing concentrations. The Raman analysis showed that, during the titration of the tungstate solutions, WO4(2-), HWO4- ions and probably W2O7(2-)
L V Del Priore et al.
Biochimica et biophysica acta, 845(1), 81-85 (1985-04-22)
Anionic activation of rod outer segment phosphodiesterase by vanadate, molybdate and tungstate is demonstrated. Comparisons are made to adenylate cyclase, which is known to be activated by vanadate and molybdate but not by tungstate. In view of the differences in
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