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Chlorine dioxide

Names IUPAC nameDioxygen chlorideOther names Chlorine dioxideChlorine(IV) oxideIdentifiers CAS Number10049-04-43D model (JSmol)Interactive imageInteractive imageChEBICHEBI:29415ChemSpider23251ECHA InfoCard100.030.135EC Number233-162-8Gmelin Reference1265 MeSHChlorine+dioxidePubChemCID24870RTECS numberFO3000000UNII8061YMS4RMUN number9191 CompTox Dashboard(EPA)DTXSID5023958InChIInChI=1S/ClO2/c2-1-3Key: OSVXSBDYLRYLIG-UHFFFAOYSA-NInChI=1/ClO2/c2-1-3Key: OSVXSBDYLRYLIG-UHFFFAOYACSMILESO=[Cl]=OO=Cl[O]Properties Chemical formulaClO2Molar mass67.45 g·mol Appearance Yellow to reddish gas OdorAcrid, somewhat chlorine-like Density2.757 g/dmMelting point−59 °C (−74 °F; 214 K) Boiling point11 °C (52 °F; 284 K) Solubility in water8 g/L (20 °C (68 °F; 293 K)) SolubilitySoluble in alkaline solutions and sulfuric acidVapor pressure>1 atmHenry's lawconstant (kH)4.01×10 (atm·m)/molAcidity (pKa) 3.0(5) Thermochemistry Std molarentropy(S298)257.22 J/K·molStd enthalpy offormation(ΔfH298)104.60 kJ/molHazards Occupational safety and health (OHS/OSH): Main hazardsHighly toxic, corrosive, unstable, powerful oxidizer GHS labelling: PictogramsSignal wordDangerHazard statementsH271, H300+H310+H330, H314, H372Precautionary statementsP210, P220, P260, P264, P271, P280, P283, P284, P301+P310, P304+P340, P305+P351+P338, P306+P360, P371+P380+P375, P403+P233, P405, P501NFPA 704 (fire diamond) 304OXLethal dose or concentration (LD, LC): LD50 (median dose)94 mg/kg (oral, rat) LCLo (lowest published)260 ppm (rat, 2 hr) NIOSH (US health exposure limits): PEL (Permissible)TWA 0.1 ppm (0.3 mg/m) REL (Recommended)TWA 0.1 ppm (0.3 mg/m)ST 0.3 ppm (0.9 mg/m)IDLH (Immediate danger)5 ppmSafety data sheet (SDS) Safety Data SheetArchive.

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