Used primarily as a research chemical in organic synthesis, particularly in the study of nitrosation reactions and diazotization processes. It serves as an intermediate in the preparation of dyes and pigments due to its ability to form stable diazonium salts. Also investigated for its role in the development of certain pharmaceuticals, where it acts as a nitrosating agent in controlled environments. Its reactivity makes it useful in studying reaction mechanisms involving nitroso compounds. However, due to potential toxicity and mutagenic properties, its use is largely restricted to laboratory settings with strict safety controls.