Hydrogen bromide

Hydrogen bromide
Ball-and-stick model of hydrogen bromide
Names
	IUPAC name Hydrogen bromide
	Preferred IUPAC name Bromane
Identifiers
CAS Number	10035-10-6 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	3587158
ChEBI	CHEBI:47266 ;
ChEMBL	ChEMBL1231461 ;
ChemSpider	255 ;
ECHA InfoCard	100.030.090
EC Number	233-113-0;
KEGG	C13645 ;
MeSH	Hydrobromic+Acid
PubChem CID	260;
RTECS number	MW3850000;
UNII	3IY7CNP8XJ ;
UN number	1048
CompTox Dashboard (EPA)	DTXSID0029713 ;
	InChI InChI=1S/BrH/h1H Key: CPELXLSAUQHCOX-UHFFFAOYSA-N ;
	SMILES Br;
Properties
Chemical formula	HBr
Molar mass	80.91 g/mol
Appearance	Colorless gas
Odor	Acrid
Density	3.307 g/L (25 °C)
Melting point	−86.9 °C (−124.4 °F; 186.2 K)
Boiling point	−66.8 °C (−88.2 °F; 206.3 K)
Solubility in water	221 g/100 mL (0 °C) ; 204 g/100 mL (15 °C) ; 193 g/100 mL (20 °C) ; 130 g/100 mL (100 °C)
Solubility	Soluble in alcohol, organic solvents
Vapor pressure	2.308 MPa (at 21 °C)
Acidity (pKa)	−8.8 (±0.8); ~−9
Basicity (pKb)	~23
Conjugate acid	Bromonium
Conjugate base	Bromide
Refractive index (nD)	1.325[citation needed]
Structure
Molecular shape	Linear
Dipole moment	820 mD
Thermochemistry
Heat capacity (C)	350.7 mJ/(K·g)
Std molar; entropy (S⦵298)	198.696–198.704 J/(K·mol)
Std enthalpy of; formation (ΔfH⦵298)	−36.45...−36.13 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Highly corrosive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H335
Precautionary statements	P261, P280, P305+P351+P338, P310
NFPA 704 (fire diamond)	3 0 0 COR
	Lethal dose or concentration (LD, LC):
LC50 (median concentration)	2858 ppm (rat, 1 h); 814 ppm (mouse, 1 h)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 3 ppm (10 mg/m3)
REL (Recommended)	TWA 3 ppm (10 mg/m3)
IDLH (Immediate danger)	30 ppm
Safety data sheet (SDS)	hazard.com; physchem.ox.ac.uk
Related compounds
Related compounds	Hydrogen fluoride; Hydrogen chloride; Hydrogen iodide; Hydrogen astatide
	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

Hydrogen bromide is the inorganic compound with the formula HBr. It is a hydrogen halide consisting of hydrogen and bromine. A colorless gas, it dissolves in water, forming hydrobromic acid, which is saturated at 68.85% HBr by weight at room temperature. Aqueous solutions that are 47.6% HBr by mass form a constant-boiling azeotrope mixture that boils at 124.3 °C (255.7 °F). Boiling less concentrated solutions releases H₂O until the constant-boiling mixture composition is reached.

Hydrogen bromide, and its aqueous solution, hydrobromic acid, are commonly used reagents in the preparation of bromide compounds.

^ Favre, Henri A.; Powell, Warren H., eds. (2014). Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013. Cambridge: The Royal Society of Chemistry. p. 131. ISBN 9781849733069.
^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
^ Trummal, Aleksander; Lipping, Lauri; Kaljurand, Ivari; Koppel, Ilmar A; Leito, Ivo (2016). "Acidity of Strong Acids in Water and Dimethyl Sulfoxide". The Journal of Physical Chemistry A. 120 (20): 3663–9. Bibcode:2016JPCA..120.3663T. doi:10.1021/acs.jpca.6b02253. PMID 27115918. S2CID 29697201.
^ Perrin, D. D. Dissociation constants of inorganic acids and bases in aqueous solution. Butterworths, London, 1969.
^ ^a ^b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. ISBN 978-0-618-94690-7.
^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0331". National Institute for Occupational Safety and Health (NIOSH).
^ "Hydrogen bromide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

[1] Favre, Henri A.; Powell, Warren H., eds. (2014). Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013. Cambridge: The Royal Society of Chemistry. p. 131. ISBN 9781849733069.

[2] Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.

[3] Trummal, Aleksander; Lipping, Lauri; Kaljurand, Ivari; Koppel, Ilmar A; Leito, Ivo (2016). "Acidity of Strong Acids in Water and Dimethyl Sulfoxide". The Journal of Physical Chemistry A. 120 (20): 3663–9. Bibcode:2016JPCA..120.3663T. doi:10.1021/acs.jpca.6b02253. PMID 27115918. S2CID 29697201.

[4] Perrin, D. D. Dissociation constants of inorganic acids and bases in aqueous solution. Butterworths, London, 1969.

[b1-5] Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. ISBN 978-0-618-94690-7.

[PGCH-6] NIOSH Pocket Guide to Chemical Hazards. "#0331". National Institute for Occupational Safety and Health (NIOSH).

[7] "Hydrogen bromide". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

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