Primarily used as a reagent in organic synthesis, it facilitates the formation of nitroso compounds and diazonium salts, which are essential intermediates in various chemical reactions. It is also employed in the production of pharmaceuticals, particularly in the synthesis of drugs that require nitrosation or diazotization steps. In industrial settings, it serves as a precursor for the preparation of rubber accelerators and corrosion inhibitors. Additionally, it has applications in analytical chemistry as a derivatizing agent for detecting amines and other nitrogen-containing compounds. Its use in recreational contexts, though illegal and dangerous, is noted for its vasodilatory effects.