Gas evolution reaction explained

A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide.^{[1] [2]} Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.^[3]

Examples

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

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):

2HCl + F_2 -> 2HF + Cl_2 ^

See also

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

Notes and References

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