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Ammonium Paratungstate (APT) Physical & Chemical Properties

Ammonium paratungstate (or APT) is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(H2W12O42)·4H2O

Physical and chemical properties of Ammonium paratungstate

Chemical formula : (NH4)10(H2W12O42)·4H2O or 5(NH4)2O.12WO3.5H2O

Under different crystallization conditions may have the following formula :

(1) 3(NH4)2O-7WO3-6H2O

(2) 5(NH4)2-1 2WO3-5H2O

(3) 5(NH4)2O-1 2WO3-5H2O

(4) 5(NH4)2O-1 2WO3-1 1H2O

Molar mass : 3132.2 g/mol

Appearance : White crystalline powder or yellow powder.

Boiling point Decomposes at 600 °C

Solubility : slightly soluble in water, while 20 ℃ solubility less than 2% in water, insoluble in alcohol. The Ammonium paratungstate will lose some ammonia and water of crystallization when heated to 220-280 ℃, can be converted as ammonium metatungstate. Will lose all crystal water and ammonia when heated to above 600 ℃, into completely yellow tungsten oxide.

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