7364. Phosphotungstic Acid

Nomenclature

CAS number: 12067-99-1
Tungstophosphoric acid.

Description and references

Approx composition 24WO3.2H3PO4.48H2O. The H2O content may vary appreciably. Prepn: Bailar, Inorg. Synth. 1, 132 (1939).

Properties

White or slightly yellowish-green, slightly efflorescent crystals or cryst powder. Sol in about 0.5 part water. Also sol in alcohol and in ether.

Use

As reagent for alkaloids and many other nitrogen bases, for phenols, albumin, peptone, amino acids, uric acid, urea, blood, carbohydrates; as biological stain.