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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.

Signal Word

Danger

Hazard Statements

Hazard Classifications

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

Storage Class Code

8B - Non-combustible corrosive hazardous materials

WGK

WGK 2

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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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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)
Dyes and other colorants in microtechnique and biomedical research
Kiernan JA
Coloration Technology, 122(1), 1-21 (2006)
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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