Difference Between Phosphotungstic Acid and Sodium Phosphotungstate

Difference between phosphotungstic acid and sodium phosphotungstate:

Phosphotungstic acid is short for PTA or TPA, it is a kind of heteropolyacid, often appears as hydrate, it is grey or light yellow small particles, melting point is 89℃, soluble in water, solution is transparent, no obvious poisoning, has mild acidity.

Sodium phosphotungstate is dissolved by sodium tungstate and sodium hydrogen phosphate, add concentrated hydrochloric acid, by concentrated crystalline process will get white fine crystalline, it is easy to soluble in water, mainly used to produce painting and analysis agent.

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