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Physical & Chemical properties

Boiling point

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Description of key information

The boiling point for anhydrous hydrogen bromide (HBr) is in range of -67.0 to -66.5 ºC. The boiling point for aqueous mixtures at 101.323 hPa (760 mm Hg) pressure is 126 ºC.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
-66.5 °C

Additional information

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).