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Merck
CN

455970

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)
NACRES:
NA.23
PubChem Substance ID:
UNSPSC Code:
12352302
MDL number:
Assay:
99.995% trace metals basis (Purity excludes up to 300 ppm Si)
Form:
powder or crystals
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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

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

Storage Class

8B - Non-combustible corrosive hazardous materials

wgk

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

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



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Membranes based on phosphotungstic acid and polybenzimidazole for fuel cell application
Staiti P, et al.
Journal of Power Sources, 90(2), 231-235 (2000)
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)
Dyes and other colorants in microtechnique and biomedical research
Kiernan JA
Coloration Technology, 122(1), 1-21 (2006)



Global Trade Item Number

SKUGTIN
455970-50G04061833598481
455970-10G04061833482773