The chemical equation for the decomposition of ammonium metatungstate can vary depending on the conditions and environment, but in general, ammonium metatungstate decomposes at high temperatures to ammonium tungstate and ammonia gas, and may further decompose to tungsten trioxide. Here are two possible chemical equations:
Thermal decomposition of ammonium metatungstate to ammonium tungstate and ammonia gas
Ammonium metatungstate first decomposes to ammonium tungstate and ammonia gas at high temperatures. This reaction can be expressed as:
((NH_4)2W{12}O_{40} \rightarrow 2(NH_4)_2WO_4 + 11H_2O)
In this reaction, ammonium metatungstate (APT) decomposes to produce ammonium tungstate and water. Note that this equation may vary slightly depending on the specific experimental conditions and the form of the ammonium metatungstate (e.g., the amount of water of crystallization).
Further decomposition of ammonium metatungstate to tungsten trioxide
At higher temperatures, ammonium tungstate may further decompose to tungsten trioxide (WO₃). However, the single equation directly from ammonium metatungstate to tungsten trioxide can be complex, as it involves multiple intermediate steps and possible side reactions. Roughly, however, it can be expressed as:
((NH_4)6H_2W{12}O_{40} \cdot H_2O + O_2 \to NH_3 + H_2O + WO_3)
Note that this equation is a simplified representation of the changes that ammonium metatungstate may undergo and does not accurately reflect all possible intermediate steps and products.
The decomposition of ammonium metatungstate is a complex process that may involve multiple steps and intermediate products. Under different temperature and environmental conditions, ammonium metatungstate will first decompose to ammonium tungstate and ammonia gas, and then ammonium tungstate may further decompose to tungsten trioxide. The specific equations for these reactions may vary depending on the experimental conditions and the form of ammonium metatungstate. In practice, various factors need to be considered to optimize the decomposition process to obtain the desired product and purity.
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