Ammonium metatungstate hydrate (AMT) is also more effective than ammonium metatungstate hydrate. Its molecular formula H28N6O41W12, molecular weight 2974.32, is a white crystalline powder or slightly yellow with a melting point of 100 ° C. Water solubility is one of the characteristics of meta tungsten; Ammonium metatungstate is a inorganic compound, which is soluble in water and ethanol. The solubility of ammonium metatungstate refers to the maximum amount of ammonium metatungstate that can be dissolved in a unit volume of solvent at a certain temperature. The solubility of ammonium metatungstate is affected by many factors, such as temperature, pH value, ionic strength, etc.
Temperature is one of the important factors affecting the solubility of ammonium metatungstate.
Generally speaking, an increase in temperature will increase solubility. At room temperature, the solubility of ammonium metatungstate is approximately 1.5 g/100 mL. When the temperature rises to 60 ℃, its solubility can reach 4.5 g/100 mL. This is because an increase in temperature increases the thermal motion of solvent molecules, increasing their frequency of collision with solid molecules, thereby promoting the dissolution process.
The pH value also affects the solubility of ammonium metatungstate.
Under acidic conditions, the solubility of ammonium metatungstate is lower, while under alkaline conditions, its solubility is higher. This is because under acidic conditions, ammonium metatungstate molecules will combine with H+ions to form a more stable molecular structure, thus reducing its solubility. Under alkaline conditions, OH ions will combine with ammonium metatungstate to form a more stable molecular structure, thus increasing its solubility.
Ionic strength also affects the solubility of ammonium metatungstate.
Ionic strength refers to the product of ion concentration and charge number in solution. When the ionic strength increases, the solubility of ammonium metatungstate will decrease. This is because the increase of ionic strength will enhance the ion interaction in the solution, thus reducing the interaction between solvent molecules and solid molecules, thus reducing the solubility.
The solubility of ammonium metatungstate is affected by many factors, among which temperature, pH value and ionic strength are the most important factors. In practical applications, it is necessary to choose appropriate conditions based on the specific situation to control the solubility of ammonium metatungstate to meet different needs.
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