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455970

Sigma-Aldrich

Phosphotungstic acid hydrate

99.995% trace metals basis (Purity excludes up to 300 ppm Si)

Synonym(s):

Tungstophosphoric acid

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About This Item

Linear Formula:
H3[P(W3O10)4] · xH2O
CAS Number:
Molecular Weight:
2880.05 (anhydrous basis)
MDL number:
UNSPSC Code:
12352302
PubChem Substance ID:
NACRES:
NA.23

Quality Level

assay

99.995% trace metals basis (Purity excludes up to 300 ppm Si)

form

powder or crystals

technique(s)

blocking: suitable

impurities

≤55.0 ppm Trace Metal Analysis

mp

~95 °C (lit.)

SMILES string

O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.OP(O)(O)=O

InChI

1S/H3O4P.H2O.36O.12W/c1-5(2,3)4;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/h(H3,1,2,3,4);1H2;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

InChI key

AVFBYUADVDVJQL-UHFFFAOYSA-N

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Application

The acid selectively blocks dye components from staining the tissue by either binding to it or by acting as a mordant. It may be used a recyclable superacid catalyst for isomerization reaction of cycloalkanes. It may simply be used as an acid catalyst for the following reactions:
  • Prins cyclization reaction
  • dehydration of alcohols
  • hydration of olefins.3
Phosphotungstic acid based membranes may be used for fuel cell applications.

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Danger

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Chronic 2 - Eye Dam. 1 - Skin Corr. 1C

wgk_germany

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Dyes and other colorants in microtechnique and biomedical research
Kiernan JA
Coloration Technology, 122(1), 1-21 (2006)
The role of phosphotungstic and phosphomolybdic acids in connective tissue staining I. Histochemical studies
Everett MM and Miller WA
The Histochemical Journal, 6(1), 25-34 (1974)
Membranes based on phosphotungstic acid and polybenzimidazole for fuel cell application
Staiti P, et al.
Journal of Power Sources, 90(2), 231-235 (2000)
Roger A Moore et al.
Biochimica et biophysica acta. Proteins and proteomics, 1866(11), 1174-1180 (2018-10-05)
Prions represent a class of universally fatal and transmissible neurodegenerative disorders that affect humans and other mammals. The prion agent contains a pathologically aggregated form of the host prion protein that can transmit infectivity without any bacterial or viral component
Xu Wang et al.
The EMBO journal, 39(13), e104168-e104168 (2020-05-13)
Morphogenesis of many protozoans depends on a polarized establishment of cytoskeletal structures. In malaria-causing parasites, this can be observed when a round zygote develops into an elongated motile ookinete within the mosquito stomach. This morphogenesis is mediated by the pellicle

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