Biochemistry (Henderson-Hasselbalch Relationships)

Calculate the pH of mixture of 0.1 M acetic acid (CH₃COOH) and 0.2 M sodium acetate (CH₃COO^-).(The pH acetic acid is 4.76).

                                     [deprotonated]

           pH = pKa + log ----------------  

                                       [protonated]

           CH3COOH⇌CH₃COO^- + H⁺

                                     [CH₃COO^-]

           pH = pKa + log ----------------  

                                     [CH3COOH]

                                     [0.2]

           pH = pKa + log ------

                                     [0.1]

          pH = 4.76 + 0.301

          pH = 5.06