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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 0.124 M lactic acid (HC3H5O3, pKa = 3.86) is titrated with 0.124 M NaOH solution. (Assume that all solutions are at 25°C.) Calculate the pH after the addition of the following amounts of NaOH. (25.1 ml)