Calculate concentration of hydrogen ions and pH of the ammonia buffer solution containing [NH4Cl] = 0.125 mol/dm3 and [NH3] = 0.225 mol/dm3 (K = 1.8 10-5). 0.4 point

How will the concentration of hydrogen ions and the pH of this buffer change after adding 2 cm3 of HCl at a concentration of 1 mol/dm3 to it?

How will the concentration of hydrogen ions and the pH of this solution change if 2 cm3 of a 0.25 molar NaOH solution is added to it?

How will the concentration of hydrogen ions in 1 dm3 of water change if we add to it successively 1 cm3 of 1 molar HCl and 1 cm3 of 1 molar NaOH.