What is the conjugate acid of the Brønsted-Lowry base, CH₃NH₂?

The conjugate acid is the CH₃NH₃⁺ (methylammonium)

Explanation:

As every, Bronsted Lowry base the methylamine can accept a proton to water to become, methylammonium.

This is the reaction, where the water is the acid, the methylamine is the weak base and the conjugate base is the hydroxides, while the methylammonium is the conjugate strong acid.

We say that is strong, because it can react to water, to make hydrolisis so, we can get methylamine again.

CH₃NH₂ + H₂O ⇄ CH₃NH₃⁺ + OH⁻ Kb

Reaction for the strong conjugate acid

CH₃NH₃⁺ + H₂O ⇄ CH₃NH₂ + H₃O⁺ Ka