does the pH increase, decrease or remain the same?

Question

After addin LiF to an aqeous HF solution, KI to an aqueous HI solution, NaCLO4 to an aqueous NaOH solution, NH4CL to an aqueous NH3 solution does the pH increase, decrease or remain the same

Answer 1

It increases, but very slightly, due to the presense of Ammonia (NH3).