The physical properties of ammonium metatungstate (AMT) and ammonium paratungstate (APT) are different as follows:
Color and form
Ammonium metatungstate (AMT): usually white crystalline powder or slightly yellow.
Ammonium paratungstate (APT): monoclinic small transparent crystals or white crystals, with two forms of flake or needle.
Solubility
Ammonium metatungstate (AMT): soluble in water, which is one of the main differences between it and ammonium paratungstate.
Ammonium paratungstate (APT): slightly soluble in water, with a solubility of less than 2% in water at 20°C, and insoluble in alcohol.
Thermal stability
Ammonium metatungstate (AMT): no detailed thermal stability data is provided, but as an inorganic compound, it may show some degree of decomposition characteristics when heated.
Ammonium paratungstate (APT): when heated in air, it begins to remove some ammonia molecules below 100°C, and removes all ammonia molecules and crystal water when strongly heated, turning into yellow tungsten trioxide powder.
Density
Ammonium metatungstate (AMT): No specific density data is provided.
Ammonium paratungstate (APT): Relative density 2.3.
Others
Ammonium metatungstate (AMT): No specific data for other physical properties are provided.
Ammonium paratungstate (APT): The aqueous solution is weakly acidic, decomposes in acid and alkali solutions, and reacts with hydrogen peroxide to form soluble peroxytungstate.
The main difference between ammonium metatungstate and ammonium paratungstate in physical properties is solubility and thermal stability. Ammonium metatungstate is soluble in water, while ammonium paratungstate is slightly soluble in water. In addition, ammonium paratungstate gradually loses ammonia and crystal water when heated and converts into tungsten trioxide, which shows its strong thermal instability. These differences in physical properties determine their different uses and preparation methods in industrial applications.
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