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. The 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)
See also
- Gasogene
- Kipps apparatus
- Gas generator
- Thermal decomposition