Ammonium tetramolybdate hydrate is widely used in the production of molybdenum-based catalysts, which are essential in various industrial processes such as petroleum refining and chemical synthesis. It serves as a precursor for molybdenum oxides, which are utilized in the manufacturing of ceramics and glass to enhance their thermal and mechanical properties. Additionally, this compound is employed in the preparation of molybdenum metal and alloys, which are critical in high-strength applications like aerospace components and electrical contacts. It is also used in analytical chemistry as a reagent for the determination of phosphate and silicate concentrations in water and other samples. Furthermore, it finds application in the field of agriculture as a source of molybdenum in fertilizers to address soil deficiencies and promote plant growth.