The solubility of ammonium metatungstate hydrate exhibits the following characteristics:
Water solubility
Ammonium metatungstate hydrate is soluble in water and has a high solubility. According to the data provided in Reference Article 1, its water solubility is 300g AMT/100ml water, i.e., 300g of ammonium metatungstate hydrate can be dissolved in every 100ml of water.
Factors affecting solubility
Temperature
The solubility of ammonium metatungstate hydrate increases with increase in temperature. This is because the thermal movement of solvent molecules intensifies as the temperature rises, and the intermolecular distance increases, making it easier for solvent molecules to interact with the molecules of ammonium metatungstate hydrate, thus promoting its dissolution.
pH
Under acidic conditions, the solubility of ammonium metatungstate hydrate is lower; while under alkaline conditions, its solubility is higher. This is because under acidic conditions, the hydrogen ions in the ammonium metatungstate hydrate molecule compete with the hydrogen ions in the solvent, making the ammonium metatungstate hydrate molecule more difficult to dissolve. Whereas, under alkaline conditions, the concentration of hydrogen ions in the solution is lower and the ammonium metatungstate hydrate molecules are more likely to interact with the solvent molecules, thus facilitating their dissolution.
Ionic Strength
The solubility of ammonium metatungstate hydrate is lower in solutions with high ionic strength, while its solubility is higher in solutions with low ionic strength. This is because in solutions of high ionic strength, the ionic concentration in the solution is higher, making it more difficult for the ammonium metatungstate hydrate molecules to interact with the solvent molecules, thus reducing its solubility.
Type of solvent
Ammonium metatungstate hydrate is more soluble in water than in other solvents such as ethanol.
Uses
Ammonium metatungstate hydrate is widely used in many fields, such as making tungsten metal, alloy steel, fireproof fabrics, etc. It is also the main raw material of tungsten-based catalysts in oil refineries.
Ammonium metatungstate hydrate has good water solubility, and its solubility is affected by many factors such as temperature, pH value, ionic strength and solvent type.
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