The chemical properties of ammonium metatungstate can be summarized as follows:
Solubility of ammonium metatungstate
Ammonium metatungstate is a compound that is soluble in water but insoluble in ethanol.
At 20°C, the solubility of ammonium metatungstate in water is 303.9g/100gH2O, and its solubility increases with increasing temperature.
Chemical formula and molecular weight of ammonium metatungstate
Chemical formula of ammonium metatungstate
(NH4)6H2W12O40·xH2O (where x represents the number of water molecules, which may vary due to preparation conditions)
Molecular weight of ammonium metatungstate
Different sources give different molecular weight values, but the most common ones may be 2974.32000 (exact mass is 2975.44000) or 2956.30.
Decomposition properties of ammonium metatungstate
The decomposition temperature of ammonium metatungstate varies depending on the degree of completion of the decomposition reaction.
At 200-300℃, all crystal water and most of the ammonium ions are removed.
Phase transition occurs at 300-350℃ to generate metastable tungsten oxide.
When the heat treatment temperature rises to 500-550℃, there are still a small amount of ammonium ions and bound water that have not been decomposed.
When the heat treatment temperature is above 600℃, it is completely decomposed into tungsten trioxide (WO3).
When the temperature rises to 700℃ and the insulation time is 2h, hollow mesoporous tungsten trioxide balls can be obtained.
Redox properties of ammonium metatungstate
Ammonium metatungstate has strong oxidizing and reducing properties and can cause fire and explosion.
When encountering organic matter, reducing agents and combustible substances, ammonium metatungstate will cause combustion or explosion.
Other chemical properties of ammonium metatungstate
Ammonium metatungstate is harmless and weakly acidic.
Ammonium metatungstate is an important compound product in the tungsten smelting process. It has a wide range of uses. It can be used as a raw material for catalysts, capacitors, nuclear shielding, flame retardants, and corrosion reducers. It is also an excellent raw material for making ultrafine tungsten powder, high-density alloy tungsten powder, phosphotungstic acid, arsenic tungstic acid, and silicotungstic acid.
The above chemical properties may vary slightly due to factors such as preparation conditions, purity, and environmental conditions. In actual applications, it is recommended to refer to specific product manuals or related literature. If necessary, please visit our website or directly contact our sales engineer at CTIA GROUP LTD.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
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Email: sales@chinatungsten.com
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