Ammonium metatungstate hydrate loses its water of crystallization under the following conditions:
Temperature
Ammonium metatungstate hydrate tends to lose water of crystallization at high temperatures. According to the information in the referenced article, ammonium metatungstate loses some of its ammonia and water of crystallization at high temperatures (e.g., when heated to 220-280°C) and is converted to AMT (which may refer to an intermediate product or a specific compound).
When heated above 600°C, ammonium metatungstate loses all ammonia and water of crystallization and is completely converted to yellow tungsten oxide.
Other conditions
Although the effect of specific pH and ionic strength on the loss of water of crystallization of ammonium metatungstate hydrate is not explicitly mentioned in the referenced article, in general, the stability and reactivity of a chemical substance may be affected by the pH and ionic strength of the solution.
Ammonium metatungstate hydrate loses its water of crystallization mainly at elevated temperatures, especially in the temperature range of 220-280 °C and above 600 °C. The water of crystallization of ammonium metatungstate hydrate is lost at temperatures in excess of 600 °C and above. At these temperatures, ammonium metatungstate undergoes a series of chemical changes, ranging from the loss of some water of crystallization and ammonia to the eventual complete conversion to yellow tungsten oxide. Although the direct effects of pH and ionic strength on the loss of water of crystallization of ammonium metatungstate hydrate are not specified in the referenced article, both factors may affect the stability and reactivity of the chemical in general.
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