The difference between ammonium metatungstate and ammonium paratungstate in solubility is mainly reflected in the following aspects:
Solubility
Ammonium metatungstate (AMT): At 20°C, the solubility of ammonium metatungstate (AMT) in water is relatively high, 303.9g/100gH₂O. This means that under standard conditions, 303.9 grams of ammonium metatungstate can be dissolved in every 100 grams of water.
Ammonium paratungstate (APT): Its solubility is relatively low, and its solubility in water at 20°C is less than 2%. This means that under the same conditions, the solubility of ammonium paratungstate in water is significantly less than that of ammonium metatungstate.
Solubility characteristics
Ammonium metatungstate: It is a white or light yellow crystalline powder that is soluble in water. It is easily soluble in water and ethanol.
Ammonium paratungstate: It is slightly soluble in water, but insoluble in ethanol. Its aqueous solution is weakly acidic and can be converted into ammonium metatungstate under certain conditions (such as heating).
Effect of temperature on solubility
The solubility of ammonium metatungstate increases with increasing temperature, indicating that its solubility in water is greatly affected by temperature. The information that the solubility of ammonium paratungstate is affected by temperature is not explicitly mentioned in the reference article, but in general, the solubility of inorganic salts is also usually affected by temperature.
In summary, the main difference between ammonium metatungstate and ammonium paratungstate in solubility is that ammonium metatungstate has higher solubility and wider solubility characteristics (soluble in both water and ethanol), while ammonium paratungstate has relatively poor solubility and is only soluble in water. These differences may affect their applications in different fields and processes.
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