Phosphotungstic Acid

Phosphotungstic acid is a pale yellow or gray fine crystal chemical which is the heteropolyacids of H3PW12O40 and it will usually appears in hydrate. Phosphotungstic acid structure generally called Keggin structure, this ion has a complete full tetrahedral symmetry, 12 tungsten atoms and oxygen atoms connected to form a cage in the middle is a phosphorus atom. Its physical properties are as follows: chemical formula: H3O40PW12.xH2O, molecular weight: 2880.05, molar mass: 2880.2g / mol, melting point: 89 ℃, soluble in alcohol, ether and water, and no significant toxicity, but it is slightly acidic with irritants.
Phosphotungstic acid chemical properties are as follows: an aqueous solution of phosphotungstic acid is a strong oxidant and the free acid is a strong acid. It is unstable when it contact with alkali metal, most common metals, metal oxides, strong reducing agents, carbonates and cyanide exposure. Besides it cannot compatibility with ammonia, aliphatic amines, alkanolamines, aromatic amines, amino compound, an organic acid anhydride, isocyanates, alkylene oxide, and epichlorohydrin.

 

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