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Topic summary

Chlorine dioxide

Chlorine dioxide
Names IUPAC name
Dioxygen chloride
Other names
  • Chlorine dioxide
  • Chlorine(IV) oxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard100.030.135EC Number
  • 233-162-8
1265 MeSHChlorine+dioxide
RTECS number
  • FO3000000
UNII
UN number9191
  • InChI=1S/ClO2/c2-1-3
    Key: OSVXSBDYLRYLIG-UHFFFAOYSA-N
  • InChI=1/ClO2/c2-1-3
    Key: OSVXSBDYLRYLIG-UHFFFAOYAC
  • O=[Cl]=O
  • O=Cl[O]
Properties ClO2Molar 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) 8 g/L (20 °C (68 °F; 293 K)) SolubilitySoluble in alkaline solutions and sulfuric acidVapor pressure>1 atm4.01×10 (atm·m)/molAcidity (pKa) 3.0(5) Thermochemistry 257.22 J/K·mol104.60 kJ/molHazards Occupational safety and health (OHS/OSH):
Main hazards
Highly toxic, corrosive, unstable, powerful oxidizer GHS labelling: DangerH271, H300+H310+H330, H314, H372P210, 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)
3
0
4
OX
Lethal dose or concentration (LD, LC): 94 mg/kg (oral, rat) 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.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chlorine dioxide is a chemical compound with the formula ClO2 that exists as yellowish-green gas above 11 °C (52 °F), a reddish-brown liquid between 11 and −59 °C (52 and −74 °F), and as bright orange crystals below −59 °C (−74 °F). It is usually handled as an aqueous solution. It is commonly used as a bleach. Applications are in food processing and as a disinfectant.

Wikipedia source