Gas evolution reaction
From Wikipedia, the free encyclopedia
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.[citation needed]
Examples
- A replacement reaction concerning zinc metal and dilute sulfuric acid.
- In this example, diatomic hydrogen gas is released. Dilute hydrochloric acid can be used in place of dilute sulfuric acid.
![{\displaystyle {\mathrm {Zn} {}+{}\mathrm {H} {\vphantom {A}}_{\smash[{t}]{2}}\mathrm {SO} {\vphantom {A}}_{\smash[{t}]{4}}{\mskip {2mu}}(\mathrm {dil} ){}\mathrel {\longrightarrow } {}\mathrm {ZnSO} {\vphantom {A}}_{\smash[{t}]{4}}{}+{}\mathrm {H} {\vphantom {A}}_{\smash[{t}]{2}}\uparrow {}}}](http://wikimedia.org/api/rest_v1/media/math/render/svg/498459cdfd39076d6aed6978731e3c0ccc231e64)
- A replacement reaction where gaseous hydrogen chloride and fluorine gas react to release diatomic chlorine gas (because fluorine is more electronegative):
![{\displaystyle {2\,\mathrm {HCl} {}+{}\mathrm {F} {\vphantom {A}}_{\smash[{t}]{2}}{}\mathrel {\longrightarrow } {}2\,\mathrm {HF} {}+{}\mathrm {Cl} {\vphantom {A}}_{\smash[{t}]{2}}\uparrow {}}}](http://wikimedia.org/api/rest_v1/media/math/render/svg/3c66f778dce6880ea4e8fd478a2c7af8e50c9935)