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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. Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.

Examples

• A replacement reaction concerning zinc metal and dilute sulfuric acid.

${\displaystyle {\ce {Zn + H_2SO_4 (dil) -> ZnSO_4 + H_2 ^}}}$

In this example, diatomic hydrogen gas is released. Dilute hydrochloric acid can be used in place of dilute sulfuric acid.

• A replacement reaction where gaseous hydrogen chloride and fluorine gas react to release diatomic chlorine gas (because fluorine is more electronegative):

${\displaystyle {\ce {2HCl + F_2 -> 2HF + Cl_2 ^}}}$

See also

• Gasogene
• Kipps apparatus
• Gas generator
• Thermal decomposition
• Oxygen evolution

References

1. "CHEMICAL REACTIONS". www.ric.edu. Retrieved 2020-11-28.
2. "7.8: Acid–Base and Gas Evolution Reacted". Libretexts. 2017-08-11. Retrieved 2020-11-28.
3. "Gas Evolution - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2020-11-28.

• Chemical reactions
• Industrial gases