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.^[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.

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

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