Chlorine dioxide

Chlorine dioxide
Structural formula of chlorine dioxide with assorted dimensions	Spacefill model of chlorine dioxide
Names
	IUPAC name Chlorine dioxide
	Other names Chlorine(IV) oxide;
Identifiers
CAS Number	10049-04-4 ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:29415 ;
ChemSpider	23251 ;
ECHA InfoCard	100.030.135
EC Number	233-162-8;
Gmelin Reference	1265
MeSH	Chlorine+dioxide
PubChem CID	24870;
RTECS number	FO3000000;
UNII	8061YMS4RM ;
UN number	9191
CompTox Dashboard (EPA)	DTXSID5023958 ;
	InChI InChI=1S/ClO2/c2-1-3 Key: OSVXSBDYLRYLIG-UHFFFAOYSA-N ; InChI=1/ClO2/c2-1-3 Key: OSVXSBDYLRYLIG-UHFFFAOYAC;
	SMILES O=[Cl]=O; O=Cl[O];
Properties
Chemical formula	ClO2
Molar mass	67.45 g·mol−1
Appearance	Yellow to reddish gas
Odor	Acrid
Density	2.757 g dm−3
Melting point	−59 °C (−74 °F; 214 K)
Boiling point	11 °C (52 °F; 284 K)
Solubility in water	8 g/L at 20 °C
Solubility	Soluble in alkaline solutions and sulfuric acid
Vapor pressure	>1 atm
Henry's law; constant (kH)	4.01×10−2 atm m3 mol−1
Acidity (pKa)	3.0(5)
Thermochemistry
Std molar; entropy (S⦵298)	257.22 J K−1 mol−1
Std enthalpy of; formation (ΔfH⦵298)	104.60 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Highly toxic, corrosive, unstable, powerful oxidizer
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H300+H310+H330, H314, H372
Precautionary statements	P210, P220, P260, P264, P271, P280, P283, P284, P301+P310, P304+P340, P305+P351+P338, P306+P360, P371+P380+P375, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 4 OX
	Lethal 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/m3)
REL (Recommended)	TWA 0.1 ppm (0.3 mg/m3) ST 0.3 ppm (0.9 mg/m3)
IDLH (Immediate danger)	5 ppm
Safety data sheet (SDS)	Safety Data Sheet Archive.
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Chlorine dioxide is a chemical compound with the formula ClO₂ that exists as yellowish-green gas above 11 °C, a reddish-brown liquid between 11 °C and −59 °C, and as bright orange crystals below −59 °C. It is usually handled as an aqueous solution. It is commonly used as a bleach. More recent developments have extended its applications in food processing and as a disinfectant.

^ Haynes, William M. (2010). Handbook of Chemistry and Physics (91 ed.). Boca Raton, Florida, USA: CRC Press. p. 4–58. ISBN 978-1-43982077-3.
^ ^a ^b ^c ^d NIOSH Pocket Guide to Chemical Hazards. "#0116". National Institute for Occupational Safety and Health (NIOSH).
^ Dobson, Stuart; Cary, Richard; International Programme on Chemical Safety (2002). Chlorine dioxide (gas). World Health Organization. p. 4. hdl:10665/42421. ISBN 978-92-4-153037-8. Retrieved August 17, 2020.
^ "Chlorine dioxide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

[1] Haynes, William M. (2010). Handbook of Chemistry and Physics (91 ed.). Boca Raton, Florida, USA: CRC Press. p. 4–58. ISBN 978-1-43982077-3.

[PGCH-2] NIOSH Pocket Guide to Chemical Hazards. "#0116". National Institute for Occupational Safety and Health (NIOSH).

[3] Dobson, Stuart; Cary, Richard; International Programme on Chemical Safety (2002). Chlorine dioxide (gas). World Health Organization. p. 4. hdl:10665/42421. ISBN 978-92-4-153037-8. Retrieved August 17, 2020.

[IDLH-4] "Chlorine dioxide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

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