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Ammonium tetramolybdate physical properties
Ammonium tetramolybdate is a chemical compound with the molecular formula (NH₄)₂Mo₄O₁₃. It is a molybdenum compound that is commonly encountered in chemical laboratories and industrial processes. Here are some key aspects of ammonium tetramolybdate:
1. Chemical Structure:
The compound consists of ammonium ions (NH₄⁺) and a polymeric anion composed of four molybdenum atoms (Mo₄) surrounded by oxygen atoms. The molecular formula reflects the presence of four ammonium ions for each tetramolybdate unit.
Ammonium tetramolybdate is often encountered as a white or slightly yellow crystalline powder. Its physical form may vary depending on factors such as hydration.
It can be synthesized by reacting molybdenum trioxide (MoO₃) with ammonium hydroxide (NH₄OH). The resulting product can undergo further processing to obtain different forms, including hydrates.
Ammonium tetramolybdate has several applications, most notably in the preparation of catalysts, particularly for the synthesis of heteropoly acids and other molybdenum-containing compounds.
It is also used in the production of molybdenum metal, which finds applications in the metallurgical and aerospace industries.
In analytical chemistry, ammonium tetramolybdate is employed as a reagent for the determination of phosphates.
As a source of molybdenum, ammonium tetramolybdate is a precursor in the synthesis of various catalysts used in chemical processes, such as oxidation reactions and desulfurization of fuels.
Ammonium tetramolybdate is typically soluble in water. The solubility may vary with temperature and the specific hydrate form.