Ionization of hydrochloric acid:

The acidic protons on methylamine are linked to nitrogen that is less electronegative as compared to the ?uorine. Hence, the N-H bonds are less polarized, and the protons are less electron de?cient. If one proton is lost, the nitrogen is left along with a negative charge that it cannot stabilize as proficiently as a halide ion. The meaning of this that methylamine is a much weaker acid as compared to the hydrogen ?uoride. Ethanoic acid is more acidic as compared to the methylamine but less acidic as compared to the hydro?uoric acid. This is since the electronegativity of oxygen lies between that of a halogen and that of a nitrogen atom.

These variations in acid strength can be illustrated if the three molecules above are placed in water. Mineral acids like HF, HCl, HBr, and HI are strong acids and dissociate or ionize completely shown in the figure.

Figure:   Ionization of hydrochloric acid.