Chemical properties:
Phosphotungstic acid is composed of four elements: phosphorus, tungsten, hydrogen, and oxygen. It is a typical compound of transition metal tungsten, and its appearance is white or slightly green crystals. It is easy to deliquesce. It is stable in acid solution and decomposes into phosphate and tungstate when azeotropic with alkali. The water content is generally between 9 and 17 molecules. It is non-toxic, non-flammable, has a certain irritation, can be dissolved in alcohol, ether and water, and has the characteristics of acidity, oxidation, reduction, catalytic activity, and good chemical stability. Its structure in water is a white octahedron; its aqueous solution is very unstable to light, and due to the effect of reduction, the aqueous solution will slowly turn blue. Phosphotungstic acid is mainly used as a biochemical reagent and also used to make pigments. It is obtained by adding phosphoric acid and hydrochloric acid to sodium tungstate solution for acidification and then extracting with ether.
Uses: Used as a biochemical reagent and chromatographic analysis reagent