Does the pH increase, decrease, or remain the same when (CH3NH3)Cl to solution of CH3NH2?

CH3NH3 - CH3NH2 is an example of acid-base conjugate pair. When CH3NH3 is added to a solution of CH3NH2, the pH would slightly decrease since in this system, CH3NH3 (from (CH3NH3)Cl ) act as the acid.
The Cl- ions would "mop up" some H+ ions in the water and thus the pH would rise.

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