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Hydrogen Halides

Chemistry: Edexcel IGCSE, topic 8.1.10

Hydrogen Halides

Halogens react with hydrogen to form hydrogen halides. Hydrogen halides are covalent compounds.

Chlorine example

Chlorine example

  • Hydrogen + chlorine → hydrogen chloride
  • H2(g) + Cl2(g) → 2HCl(g)
Acidic solutions

Acidic solutions

  • The hydrogen halides dissolve in water to form acidic solutions, such as hydrofluoric acid, hydrobromic acids and hydroiodic acid.
  • Hydrogen chloride dissolves in water to form hydrochloric acid.
  • The solutions produce H+ ions, which make them acidic.

Test yourself on Hydrogen Halides

  • Which of these are true about hydrogen halides?

  • What does hydrogen chloride form when it dissolves in water?

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