Hydrobromic Acid - HBr

What is Hydrobromic Acid?

Hydrobromic acid is a powerful acid formed in water by dissolving bromide of hydrogen. Hydrobromic acid is a diatomic molecule with the chemical formula for hydrobromic acid is HBr. Hydrogen bromide is a colorless, suffocating gas, very soluble in water and highly dissociated in aqueous solution. It readily fumes in the presence of moist air. Hydrogen bromide gas are highly corrosive substances that can cause severe burns upon contact.

Other names – Hydrogen bromide, bromane


Hydrobromic Acid


1.49 g/cm³

Molecular Weight/ Molar Mass

80.9119 g/mol

Boiling Point

122 °C

Melting Point

-11 °C

Chemical Formula


Hydrobromic Acid Structure – HBr

Hydrobromic Acid Structure

Physical Properties of Hydrobromic Acid – HBr


Pungent irritating odor


Colorless/faint yellow liquid

Covalently-Bonded Unit


Heat capacity

29.1 J/(K·mol)

Hydrogen Bond Donor



Soluble in water

Chemical Properties of Hydrobromic Acid – HBr

  • Hydrobromic acid reacts with sulfuric acid forming sulfur dioxide, bromine and water. The chemical equation is given below.
  • 2HBr + H2SO4 → Br2 + SO2 + 2H2O

  • Hydrobromic acid reacts with propene undergoes addition reaction resulting in the formation of 2-Bromopropane. The chemical equation is given below.
  • HBr + C3H6 → C3H7Br

Uses of Hydrobromic Acid – HBr

  • Used as a chemical intermediate, the major uses for elemental bromine are as a sanitizing or disinfecting agent.
  • Used as a reagent and as a catalyst in a variety of organic reactions.
  • Used in the preparation of numerous organic compounds.
  • Anhydrous hydrobromic acid is hazardous and shipped in high pressure cylinders.

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