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Hydrogen bromide
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<p>Hydrogen bromide is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula HBr. It is a <a href="/facts/Hydrogen_halide/avUQ6Nwy">hydrogen halide</a> consisting of hydrogen and bromine. A colorless gas, it dissolves in water, forming <a href="/facts/Hydrobromic_acid/T6INXDR6">hydrobromic acid</a>, 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 <a href="/facts/Azeotrope/ItfBAN1N">azeotrope</a> mixture that boils at 124.3 °C (255.7 °F). Boiling less concentrated solutions releases H2O until the constant-boiling mixture composition is reached. </p><p>Hydrogen bromide, and its aqueous solution, hydrobromic acid, are commonly used reagents in the preparation of bromide compounds. </p>