Hydrobromic Acid and Hydrogen Bromide

Hydrogen bromide has not been found to be carcinogenic or to show reproductive or developmental toxicity in humans. 

Noncombustible, but contact with metals may produce highly flammable hydrogen 

Hydrobromic acid and hydrogen bromide react violently with many metals with the generation of highly flammable hydrogen gas, which may explode. Reaction with oxidizers such as permanganates, chlorates, chlorites, and hypochlorites may produce chlorine or bromine. 

Hydrobromic acid should be handled in the laboratory using the basic pmdent practices described in Chapter 5.C. Splash goggles and rubber gloves should be worn when handling this acid, and containers of HBr should be stored in a well-ventilated location separated from incompatible metals. Water should never be added to HBr because splattering may result always add acid to water. Containers of hydrobromic acid should be stored in secondary plastic trays to avoid corrosion of metal storage shelves due to drips or spills. 

---

Hydrobromic Acid and Hydrogen Bromide Hydrochloric Acid and Hydrogen Chloride Hydrogen Hydrogen Cyanide... 

Pyridino-bromo-titanic Acid, (CsHsN)2.H2TiBr6, is formed by saturating a solution of pyridine hydrobromide and titanic acid in alcoholic hydrobromic acid with hydrogen bromide.1... 

Lenher 6 determined the atomic weight of tellurium by decomposing weighed amounts of potassium telluribromide, K2TeBr6, by means of chlorine and hydrogen chloride, and weighing the potassium chloride which remained. Using tellurium ores from three different sources, the oxide obtained was converted into the double bromide by the action of hydrobromic acid and potassium bromide the telluribromide formed was crystallised repeatedly from water. As a mean of sixteen concordant experiments Lenher obtained the value 127-55. 

Synonyms and trade names anhydrous hydrobromic acid, anhydrous hydrogen bromide, hydrobromic acid... 

Measurements of the spectrum of hydrobromic acid or hydrogen bromide HBr have been presented by Goodeve and Taylor (1935), and... 

Hydrobromic acid or hydrogen bromide is a colorless and corrosive liquid or gas, respectively, with a sour taste and acrid odor. The gas liquefies at —66.5°C (—87°F) and freezes at —86°C (—122°F). The constant-boihng acid is an aqueous solution of 47.5% HBr, boiling at 126°C (258°F). Saturated aqueous solution contains 66% HBr at 25°C (77°F) the aqueous solutions are strongly acidic. 

Hydrogen bromide adds to acetylene to form vinyl bromide or ethyHdene bromide, depending on stoichiometry. The acid cleaves acycHc and cycHc ethers. It adds to the cyclopropane group by ring-opening. Additions to quinones afford bromohydroquinones. Hydrobromic acid and aldehydes can be used to introduce bromoalkyl groups into various molecules. For example, reaction with formaldehyde and an alcohol produces a bromomethyl ether. Bromomethylation of aromatic nuclei can be carried out with formaldehyde and hydrobromic acid (6). 

Chemical Reactivity - Reactivity with Water Reacts slowly generating hydrogen bromide (hydrobromic acid) Reactivity with Common Materials Decomposes rapidly in the presence of all common metals except nickel and lead, liberating heat and hydrogen bromide Stability During Transport Stable Neutralizing Agents for Acids and Caustics Rinse with sodium bicarbonate or lime... 

The potassium and ammonium selenibromides have been prepared by dissolving selenium dioxide in hydrobromic acid and adding either potassium or ammonium bromide. The selenibromides are orange-red in colour and are decomposed by water into selenious acid, hydrogen bromide and the alkali bromide, yielding colourless solutions.1... 

Thionyl chloride readily converts butanediol to 1,4-dichlorobutane and hydrogen bromide gives 1,4-dibromobutane. A procedure using 48% hydrobromic acid with a Dean-Stark water trap gives good yields of 4-bromobutanol, free of diol and dibromo compound. 

Hydrogen bromide, HBr, is a colorless gas. Its solution in water, hydrobromic acid, is a strong acid. The principal salts of hydrobromic acid are sodium bromide, NaBr, and potassium bromide, KBr, vhich are used in medicine, and silver bromide, AgBr, which, like silver chloride AgCl, and silver iodide, Agl, is used in making photographic emulsions. v... 

A similar investigation concerning the action of hydrogen on silver bromide and the inverse action gave Jouniaux 13700 calories for the heat of formation of diver bromide at the expense of hydrobromic acid and silver, while Berthelot s measurements give 14800 calories... 

The constant-boiling mixture of hydrobromic acid and water can be conveniently used to prepare alkyl bromides. The acid boils at 126°, contains about 47.5 per cent of hydrogen bromide, and has a specific gravity of about 1.48. 

Cyclopropane-1,1-dicarboxylic acid (30a) reacted with hydrobromic acid to (2-bro-moethyl)malonic acid (31a) . In a similar reaction, ethyl 1-acetylcyclopropane-l-carboxylate (31b) ( C enriched) was converted to 5-bromopentan-2-one upon treatment with hydrobromic acid and decarboxylation." In 2-benzoyl-3-phenylcyclopropane-1,1-dicarboxylic acid (31c), two different activating functions are present and can influence the addition of hydrogen bromide. In fact, products arising from the cleavage of either bond that link the phenyl-substituted carbon were isolated. Both primary products had lost hydrogen bromide and carbon dioxide. 

A sample of 2 g. of ammonium para-molybdate is treated with 20 ml. of 9 M hydrobromic acid and is gently boiled to drive off the liberated bromine. The solution is evaporated almost to dryness. The process is repeated with a second 20-ml. portion of hydrobromic acid. Finally the residue is dissolved in 10 ml. of 9 M hydrobromic acid. The solution is concentrated to half volume and cooled in a freezing mixture. Anhydrous hydrogen bromide gas is rapidly passed through this solution to precipitate reddish-brown, crystalline ammonium pentabromooxomolybdate(2 —). This solid is filtered and dried in a vacuum desiccator over solid KOH to constant weight yield is 3 g. Anal. Calcd. for (NH4)2[MoOBr5] Mo, 17.52 Br, 73.00 N, 5.11. Found Mo, 18.01 Br, 72.51 N, 5.48. The oxidation state of the metal was found to be 4.99, and the magnetic moment pen = 1.79 B.M. at 303°K. 

BROMURO de AZUFRE (Spanish) (13172-31-1) Combustible liquid. Reacts with moisture in air, steam, or oxidizers, emitting fumes of hydrogen bromide and sulfur dioxide. Reacts with water, forming hydrobromic acid and fumes of hydrogen bromide and sulfur dioxide. Violent reaction with strong oxidizers, chromyl chloride, diethylzinc, dimethyl sulfoxide, lead dioxide, nitric acid, potassium. Incompatible with hexafluoroisopropylide-neaminolithium, iron sulfide, nickel, red phosphorus. Attacks most metals in the presence of moisture. 

---