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HOS(Cl)O? Colourless liquid... Hydrolysed by water. Used as a chlorinating and sulphonating agent.
chlorosulphuric acid . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/chlorosulphuric%20acid/1/eng (23.07.2026)