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Physical & Chemical properties

Appearance / physical state / colour

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Description of key information

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.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
gaseous

Additional information

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..