Tris base when dissolved forms a solution of about pH 11, though this varies depending on how much you are dissolving, as it has some buffering capacity that means that at low concentrations the pH will be dependent on the pH of the water (MilliQ is about pH 6 due to the deionisation process), so it is theoretically possible to make a pH 7.4 solution of tris with no addition of NaOH or HCl