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Gas evolution reaction

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A gas evolution reaction is a chemical reaction in which one of the end products is a gas (such as oxygen or carbon dioxide) is produced. See also oxygen evolution. Acid-base reactions are a specific type of gas evolution reaction. There are also gas evolution reactions that are formed by the mixing of two aqueous solutions. These reactions are a sub-type of double replacement or double displacement reactions. Most of gas evolution reactions are done in a fume chamber because some of the gases are very poisonous when inhaled while other gases are explosive.

Examples

  • A replacement reaction concerning zinc metal and hydrogen chloride:
    • Zn + 2 HCl → ZnCl
    2     + H
    2     (gas)In this example, hydrogen gas in diatomic form is released.
  • A replacement reaction where gaseous hydrogen chloride and fluorine gas react to release diatomic chlorine gas (because fluorine is more electronegative):
    • 2 HCl + F
    2     → 2 HF + Cl
    2     (gas)

    References

    Gas evolution reaction Wikipedia
    (Text) CC BY-SA


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