Chlorosulfonic Acid

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chlorosulfonic acid

[¦klȯr·ō·səl′fän·ik ′as·əd]
(inorganic chemistry)
ClSO2OH A fuming liquid that decomposes in water to sulfuric acid and hydrochloric acid; used in pharmaceuticals, pesticides, and dyes, and as a chemical intermediate.

Chlorosulfonic Acid


SO2Cl(OH), a monochloroanhydride of sulfuric acid. A colorless, mobile liquid, chlorosulfonic acid has a melting point of – 80°C, a boiling point at atmospheric pressure of 155°C (with decomposition), and a density of 1.75 g/cm3. It is chemically very reactive. It reacts vigorously with water, forming sulfuric and hydrochloric acids, and it fumes in the presence of atmospheric moisture. It also reacts with many organic and inorganic compounds. Chlorosulfonic acid is produced by the reaction of hydrogen chloride with sulfur trioxide: HCl + SO3 = SO2Cl(OH). In the absence of moisture, it can be stored and transported in steel containers. Chlorosulfonic acid is used in the production of dyes, detergents, and drugs; it is also used as a smoke producer.


References in periodicals archive ?
Chlorosulfuric acid was added dropwise slowly for functionalization reaction of DVB [8].