Ammonium metatungstate hydrate has good thermal stability, but it will undergo decomposition reaction at high temperature. The decomposition temperature depends on the number of water molecules in the hydrate, its purity and the heating conditions. Generally speaking, ammonium metatungstate hydrate will lose part or all of its crystallization water when heated to a certain temperature, and transform into ammonium metatungstate or other forms of tungsten compounds. Therefore, when using ammonium metatungstate hydrate, care should be taken to control the heating temperature and time to avoid its decomposition.
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