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Elements and Compounds

What are the physical properties of hydrogen bromide?


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February 01, 2009 12:39AM

Hydrogen bromide is a colorless, corrosive, nonflammable gas with a sharp, unpleasant, pungent odor. The air odor threshold concentration for hydrogen bromide is 2.0 parts per million (ppm) parts of air.

CHEMICAL AND PHYSICAL PROPERTIES * Physical data 1. Molecular weight: 80.92 2. Boiling point (at 760 mm Hg): -67 degrees C (-88.6 degrees F) 3. Specific gravity: 2.77 at -67 degrees C (-88.6 degrees F) 4. Vapor density: 3.5 5. Melting point: -86.9 degrees C (-124.42 degrees F) 6. Vapor pressure at 20 degrees C (68 degrees F): Greater than 1 mm Hg 7. Solubility: Soluble in water, alcohol and organic solvents.

8. Evaporation rate: Data not available. * Reactivity 1. Conditions contributing to instability: Exposure to moisture or water, can produce hydrogen which may form explosive mixtures with air. 2. Incompatibilities: Contact between hydrogen bromide and strong oxidizers, ammonia, strong caustics, fluorine, or common metals such as, copper, brass, and zinc, mixed with moisture may cause explosive reactions to occur. A reaction of hydrogen bromide with fluorine may be accompanied by flame. The evolution of dangerous, toxic and corrosive fumes may occur when this substance mixes with water or steam. It can also react instantaneously with ozone to cause an explosion. 3. Hazardous decomposition products: Toxic gases and vapors such as hydrogen or bromine may be released in a fire involving hydrogen bromide. 4. Special precautions: None reported. * Flammability : ;; Hydrogen bromide is nonflammable gas. : ;; The National Fire Protection Association has assigned a flammability rating of 0 (minimal fire hazard) to hydrogen bromide. 1. Flash point: Not applicable. 2. Autoignition temperature: Not applicable. 3. Flammable limits in air: Not applicable. 4. Extinguishant: For small fires use dry chemical or carbon dioxide. Use water spray, fog, or regular foam to fight large fires involving hydrogen bromide. : ;; Fires involving hydrogen bromide should be fought upwind from the maximum distance possible. Keep unnecessary people away; isolate the hazard area and deny entry. Isolate the leak or spill area for at least 150 feet in all directions, until gas has dispersed. Emergency personnel should stay out of low areas and ventilate closed spaces before entering. Containers of hydrogen bromide may explode in the heat of the fire and should be moved from the fire area if it is possible to do so safely. If this is not possible, cool fire exposed containers from the sides with water until well after the fire is out. Do not get water inside the containers. Stay away from the ends of containers. Firefighters should wear a full set of chemical protective clothing and self-contained breathing apparatus when fighting fires involving hydrogen bromide.