For this problem, we are being asked to determine the pH when 150 mL of 0.10 M propionic acid (CH3CH2COOH) is mixed with 400 mL 0.0650 M potassium propionate (CH3CH2COOK)
A solution that contains a weak acid and its conjugate base is a buffer solution. The pH of a buffer solution can be determined using the Henderson-Hasselbalch equation.
A buffer solution is prepared by mixing 150 mL of 0.100 M propionic acid (HC3H5O2, Ka = 1.3 x 10-5) and 400 mL of 0.0650 M potassium propionate. What is the pH of the solution? ( hint: keep track of volumes!)