Chlorosulfonic acid is a colorless, oily liquid with a strong, pungent odor. It is a highly reactive compound, primarily used in the production of various chemicals, including detergents and dyes. Its chemical formula is ClSO3H, and it is known for its ability to sulfonate organic compounds, introducing sulfonic acid groups into their structure. Due to its corrosive nature, chlorosulfonic acid must be handled with care, as it can cause severe burns and damage to materials. It is often stored in glass or certain plastics to prevent reactions with metals. Proper safety measures are essential when working with this compound.