The chemical formulas of ammonium metatungstate (AMT) and ammonium paratungstate (APT) are:
Ammonium metatungstate (AMT): The chemical formula is (NH₄)₆H₂W₁₂O₄₀·xH₂O, where x represents the amount of crystal water, which may vary depending on the preparation conditions. Usually, the value of x is between 0 and 5.
Ammonium paratungstate (APT): The chemical formula is (NH₄)₁₀W₁₂O₄₁·xH₂O, where x also represents the amount of crystal water, and its value will also vary depending on the preparation conditions.
Both compounds are important compounds of tungsten and play an important role in the extraction and refining of tungsten and the manufacturing of tungsten alloys, catalysts and other tungsten products. Their properties such as water solubility and stability make them widely used in many industrial fields.
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