The reaction of triethylamine (Et₃N) with hydrochloric acid (HCl) is an acid-base reaction. Here's the chemical equation:

Et₃N + HCl → [Et₃NH]⁺Cl⁻

Explanation:

* Triethylamine (Et₃N): A tertiary amine, meaning it has three alkyl groups attached to the nitrogen atom.

* Hydrochloric acid (HCl): A strong acid that provides protons (H⁺) in solution.

* [Et₃NH]⁺Cl⁻: The product is an ionic compound formed by the protonation of triethylamine. The nitrogen atom in triethylamine accepts the proton from HCl, forming the triethylammonium cation ([Et₃NH]⁺) and the chloride anion (Cl⁻).

In words: Triethylamine reacts with hydrochloric acid to form triethylammonium chloride.