Question
What are the exceptions to Henry’s law? Why ?
✓
Answer
(1) The gases like $NH _3$ and $CO _2$ do not obey Henry's law.
(2) This is because, these gases react with water,
$\begin{aligned}
& NH _{3( g )}+ H _2 O _{( l )} \longrightarrow NH _{4( aq )}^{+}+ OH _{( aq )}^{-} \\
& CO _{2( g )}+ H _2 O ( l ) \rightarrow H _2 CO _{3( aq )}
\end{aligned}$
(3) Due to reactions of the gases like $NH _3, CO _{2( g )}$, they have higher solubilities than expected by Henry's law.
(2) This is because, these gases react with water,
$\begin{aligned}
& NH _{3( g )}+ H _2 O _{( l )} \longrightarrow NH _{4( aq )}^{+}+ OH _{( aq )}^{-} \\
& CO _{2( g )}+ H _2 O ( l ) \rightarrow H _2 CO _{3( aq )}
\end{aligned}$
(3) Due to reactions of the gases like $NH _3, CO _{2( g )}$, they have higher solubilities than expected by Henry's law.
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