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Hydrobromic Acid - HBr

What is Hydrobromic Acid?

Hydrobromic acid is a powerful acid formed in water by dissolving bromides 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

HBr Hydrobromic Acid
Density 1.49 g/cm³
Molecular Weight/ Molar Mass 80.9119 g/mol
Boiling Point 122 °C
Melting Point -11 °C
Chemical Formula HBr

Hydrobromic Acid Structure – HBr

Hydrobromic Acid Structure

Physical Properties of Hydrobromic Acid – HBr

Odour Pungent irritating odor
Appearance Colorless/faint yellow liquid
Covalently-Bonded Unit 1
Heat capacity 29.1 J/(K·mol)
Hydrogen Bond Donor 1
Solubility 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 undergoe 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.

Frequently Asked Questions – FAQs

What is bromane?


When bromine is added to an alkene, which reaction will happen?

Addition reaction.

What are the products of the reaction between hydrobromic acid with sulphuric acid?

Bromine, sulfur dioxide and water
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