A solution containing 50.00 mL of 0.1800 M NH3 (Kb = 1.8 ? 10-5) is being titrated with 0.3600 M HCl.Calculate the pH:a. initiallyb. after the addition of 5.00 mL of HClc. after the addition of a total volume of 12.50 mL of HCld. after the addition of a total volume of 25.00 mL of HCle. after the addition of 26.00 mL of HCl