Hydrazinium sulfate is widely used as a reducing agent in various chemical reactions, particularly in the synthesis of organic compounds. It plays a crucial role in the production of pharmaceuticals, where it is employed to create intermediates for drugs like antibiotics and antihypertensive agents. In the field of agriculture, it is utilized as a growth regulator and in the preparation of herbicides and pesticides. Additionally, it is applied in analytical chemistry for the determination of trace metals, acting as a reagent to reduce metal ions for easier detection. Its use extends to the manufacturing of explosives and rocket propellants, where it serves as a component in fuel formulations. In industrial processes, it is also employed in metal plating and corrosion inhibition, helping to protect surfaces from degradation.