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An analytical chemist is titrating 157.3 mL of a 1.000 M solution of propionic acid (HC2H5CO2) with 1.200 M solution of NaOH. The pKa of propionic acid is 4.89. Calculate the ph of the acid solution after the chemist has added 42.60mL of the NaOH solution to it. Round answer to two decimal places.