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Sigma-Aldrich

Phosphotungstic acid hydrate

for microscopy

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Synonym(s):
Tungstophosphoric acid
Linear Formula:
H3[P(W3O10)4] · xH2O
CAS Number:
Molecular Weight:
2880.05 (anhydrous basis)
MDL number:
PubChem Substance ID:
NACRES:
MA.02

grade

for microscopy

Quality Level

form

powder or crystals

impurities

≤0.002% total nitrogen (N)

loss

≤15% loss on drying

pH

2 (20 °C)

mp

~95 °C (lit.)

solubility

water: 0.5 g/10 mL, clear, colorless

anion traces

chloride (Cl-): ≤50 mg/kg
sulfate (SO42-): ≤100 mg/kg

cation traces

Ca: ≤20 mg/kg
Cu: ≤5 mg/kg
Fe: ≤20 mg/kg
K: ≤50 mg/kg
Na: ≤50 mg/kg
Pb: ≤20 mg/kg
Zn: ≤5 mg/kg

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

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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This Item
P40064559701.00582
form

powder or crystals

form

powder

form

powder or crystals

form

solid

impurities

≤0.002% total nitrogen (N)

impurities

-

impurities

≤55.0 ppm Trace Metal Analysis

impurities

-

pH

2 (20 °C)

pH

-

pH

-

pH

1.3 (20 °C, 20 g/L in H2O)

mp

~95 °C (lit.)

mp

~95 °C (lit.)

mp

~95 °C (lit.)

mp

107 °C

solubility

water: 0.5 g/10 mL, clear, colorless

solubility

-

solubility

-

solubility

water: soluble at 20 °C

General description

Phosphotungstic acid hydrate is a heteropolyacid.It is a reagent suitable to detect alkaloids and nitrogenous bases. It is suitable for manufacturing organic pigments, and additives in the plating industry. It is known to impart water resistance to plastics, adhesives, and cement. It also is suitable as a catalyst for organic reactions.

Application

Phosphotungstic acid hydrate may be used as a staining agent for the transmission electron microscope (TEM) imaging of cetyltrimethylammonium bromide (CTAB) coated gold nanorods.It may be used in the preparation of:
  1. Phosphotungstic acid doped ormosil hybrid networks
  2. Niobia supported phosphotungstic acid (PTA) catalysts
  3. Titanium dioxide (TiO2) nanoparticles /phosphotungstic acid (HPW) films.

Other Notes

Review of the folin phenol method for the quantitative determination of proteins

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

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