First thing to notice is that when the indicator is added to the NH3 alone the colour of the solution is a clear bright pink, this indicates that the solution is originally basic. As we slowly add 1 mL of NH4Cl they solution slowly changes to a light pale clear pink. This indicates that the solution is now more acidic, and the reaction shifts to the right, working to lower the concentration of hydrogen ions, and return to equilibrium. NH3 is a weak base, it produces it's conjugate acid NH4+ by donating a H+. NH3 (aq) + H+(aq) ? NH4+(aq) If I got this wrong please correct me, I need to see if this makes sence