Ammonium paramolybdate hydrate is widely used as a precursor in the production of molybdenum-based catalysts, which are essential in various industrial processes such as petroleum refining and chemical synthesis. It is also employed in the manufacturing of molybdenum metal and alloys, which are crucial for high-strength materials in aerospace and automotive industries. In agriculture, it serves as a source of molybdenum in fertilizers to promote plant growth and improve crop yields. Additionally, it is utilized in analytical chemistry as a reagent for the determination of phosphorus and arsenic in environmental and biological samples. Its role in the preparation of pigments and corrosion inhibitors further extends its application in coatings and surface treatment industries.