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EC number: 233-113-0 | CAS number: 10035-10-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
Additional information
Appearance and physical state
Anhydrous hydrogen bromide (HBr) is an irritant, colorless gas. Solutions of HBr in water form hydrobromic acid which dissociates to ions (H+ and Br-) and are clear liquids developing fumes that become brown on exposure to air and light..
Melting point/freezing point
Garlanda, T., and Basilico, S. (1993) reported an experimental melting point for anhydrous HBr of -88.5 ºC. The melting point for a solution of hydrobromic acid in water (69.2%) is -11.3 ºC. This value is supported by O’Neil, M.J. (2001) which records the melting point of hydrogen bromide as -86.9 ºC.
Boiling point
Garlanda, T., and Basilico, S. (1993) reported a boiling point in range of -67.0 to -66.5 ºC for anhydrous HBr. The boiling point for aqueous mixtures at 101.323 hPa (760 mm Hg) pressure is 126 ºC. At 53 hPa and 13 hPa (respectively 400 and 100 mm Hg), the boiling point of aqueous solutions of hydrobromic acid is given as 107 and 74.1 ºC, respectively. O’Neil, M.J. (2001) reports an experimental value of -66.5 ºC at 101.323 hPa (760 mm Hg).
Density
Garlanda, T., and Basilico, S. (1993) report the experimental vapour density for anhydrous HBr (gas) as 2.82 relative to that of air (= 1). The specific gravity for liquid HBr was reported as 2.77 at -67 ºC. The specific gravity of aqueous solutions of hydrobromic acid ranges from 1.08 for a 10 % solution at 20 ºC to 1.70 for a 60 % solution at 20 ºC. O’Neil, M.J. (2001) reports the density of HBr as 3.307 g/L.
Vapour pressure
Garlanda, T., and Basilico, S. (1993) report a vapour pressure range of 133 Pa at -138.8 ºC to 2026500 Pa at 16.8 ºC.
Surface tension
The substance is not expected to have surface tension properties.
Water solubility
Garlanda, T., and Basilico, S. (1993) report HBr as very soluble in water, forming an azeotropic mixture in water of 47.63 % with boiling point of 124.3 ºC at 101323 Pa (760 mm Hg). A saturated solution occurs at 66.5 % at 25 ºC.
Partition coefficient
Hydrobromic acid dissociates into the hydrogen and bromide ions in contact with water. As an inorganic substance HBr is expected to partition to water. A calculated value Log Kow of 0.6287 can be made; however, the KOWWIN model was trained with organic compounds, so the value should be treated with caution.
Flash point/flammability/self-ignition temperature
Hydrogen bromide is an inorganic non-flammable gas. Hydrogen bromide is not flammable in aqueous solution (hydrobromic acid).
Explosivity
Hydrogen bromide is an inorganic substance that does not contain a chemical group associated with explosivity
Oxidising
Hydrogen bromide gas can react violently when mixed with some chemicals, metals or water, forming a flammable, explosive gas. Hydrogen bromide is a reducing agent donating hydrogen. In redox reactions with other inorganic acids it can form bromine which is a strong oxidizing agent.
Stability in organic solvents
Garlanda, T., and Basilico, S., (1993) report anhydrous hydrogen bromide as soluble in alcohol, acetic acid, hexane, benzene, and toluene. Hydrobromic acid is soluble in common solvents also. Stability in organic solvents is not required for inorganic substances.
Dissociation constant
Chou, I.-M., and Eugster, H.P. (1976) report an experimental value of log K = 20.56 at 2.0 x 10-8 Pa (2 kb), 25 ºC with a generally accepted pKa of approximately -9.
Viscosity
Hydrogen bromide (HBr) is a gaseous substance. HBr is very soluble in water, with solutions of HBr in water forming hydrobromic acid which dissociates to ions (H+and Br-).
Critical temperature and pressure
O’Neil, M.J. (2001) reports the critical temperature of HBr as 89.8 ºC and the critical pressure as 8.56 x 106 Pa (84.5 atm).
Henry’s Law Constant
O’Neil, M.J. (2001) reports a Henry's law constant for hydrobromic acid as 1.32 x 109mol2 • kg-2 • atm-1at 25 ºC
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