Chemistry - Liquid Solution Question with Solution | TestHub

Henry's law is applicable only to those gases which do not react chemically with the solvent and do not undergo dissociation or association in the solution.

Gases like ${\text{NH}}_3$ and ${\text{CO}}_2$ react with water to form ${\text{NH}}_4\text{OH}$ and ${\text{H}}_2{\text{CO}}_3$ respectively.

${\text{NH}}_3+{\text{H}}_2\text{O}\rightleftharpoons {\text{NH}}_4^{+}+{\text{OH}}^{-}$

${\text{CO}}_2+{\text{H}}_2\text{O}\rightleftharpoons {\text{H}}_2{\text{CO}}_3\rightleftharpoons {\text{H}}^{+}+{\text{HCO}}_3^{-}$

Due to their chemical reaction with the solvent, their solubility is exceptionally high and they do not obey Henry's law.

Gases like ${\text{O}}_2$, ${\text{N}}_2$, and ${\text{CH}}_4$ do not react with water and thus obey Henry's law.

Answer: ${\text{NH}}_3$ and ${\text{CO}}_2$