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The basicity of ethanamine (ethylamine)

A proton acceptor

Experiment

The Erlenmeyer flask contains chlorhydric gas, a cotton swab is moistened with a solution of ethanamine: A white smoke (smoke = solid particles) ethylammonium chloride is produced. $CH_3CH_2NH_2 (g)$ $+$ $HCl (g)$ $\rightarrow$ $CH_3CH_2NH_3^+ Cl^-(s)$

Interpretation

By its electron pair on the nitrogen, which is not strongly retained (N is weakly electronegative), the amine captures a hydrogen ion $H^+$: The amine is a proton acceptor and thus a base by defining Broenstedt!

A weak base

Experiment

A light bulb is used to study the conductivity of aqueous ethylamine: The current is weak, because there are some ions in solution, but very few compared to solutions of strong acids or strong bases . The reaction with water is limited to an equilibrium:

$CH_3CH_2NH_2 (g)$ $+$ $H_2O$ $\leftrightarrows$ $CH_3CH_2NH_3^+$ $+$ $OH^-$