Gas evolution reaction

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

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