Question

61. Lactic acid is a common by-product of cellular respiration and
is often said to cause the “burn” associated with strenuous activity.
A 25.0-mL sample of 0.100 M lactic acid (HC3H5O3,
pKa 5 3.86) is titrated with 0.100 M NaOH solution. Calculate
the pH after the addition of 0.0 mL, 4.0 mL, 8.0 mL, 12.5 mL,
20.0 mL, 24.0 mL, 24.5 mL, 24.9 mL, 25.0 mL, 25.1 mL,
26.0 mL, 28.0 mL, and 30.0 mL of the NaOH. Plot the results
of your calculations as pH versus milliliters of NaOH added.