General Synonyms: chlorosulphonic acid, sulfuric chlorohydin, sulphuric chlorohydrin, monochlorosulphuric acid, monochlorosulfuric acid Use: Molecular formula: HClSO3 CAS No: 7790-94-5 EINECS No: Physical data Appearance: colourless to light yellow liquid Melting point: -80 C Boiling point: 152 C Vapour density: 4 (air = 1) Vapour pressure: 1 mm Hg at 20 C Density (g cm-3) : 1. 75 Flash point: Explosion limits: Autoignition temperature: Water solubility: decomposes Stability Stable, but reacts violently with water. In case of spills, mop up with sand-do not add water. Reacts with most metals to yield (flammable) hydrogen gas. Incompatible with strong bases, carbonates, water, combustible materials, strong oxidizing agents, most metals, organic materials, sulfides, cyanides, carbides. Toxicology Poison-may be fatal if swallowed. Corrosive-causes serious skin and eye burns. Toxicity data ( The meaning of any toxicological abbreviations which appear in this section is given here. ) Risk phrases ( The meaning of any risk phrases which appear in this section is given here. ) R14 R21 R25 R34 R41. Transport information ( The meaning of any UN hazard codes which appear in this section is given here. ) UN No 1754. Hazard class 8. Personal protection Safety glasses or face mask. Adequate ventilation.