A 25. 0 mL sample of 0. 125 molL⁻¹ pyridine (Kb=1. 7×10⁻⁹ ) is titrated with 0. 100 molL⁻¹HCl. A) Calculate the pH at 0 mL of added acid. Express your answer using two decimal places. pH = 9. 16 B) Calculate the pH at 10 mL of added acid. Express your answer using two decimal places. pH = 5. 56 C) Calculate the pH at 20 mL of added acid. Express your answer using two decimal places. pH = 4. 98 D) Calculate the pH at equivalence point. Express your answer using two decimal places. pH = 3. 24 E) Calculate the pH at one-half equivalence point. Express your answer using two decimal places. pH = 5. 23 F) Calculate the pH at 40 mL of added acid. Express your answer using two decimal places. pH = 1. 87 G) Calculate the pH at 50 mL of added acid. Express your answer using two decimal places. pH = 1. 60
