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An analytical chemist is titrating 194.8 mL of a 1.800 M solution of ethylamine (C2H5NH2) with a 0.3600 M solution of HNO3. The pKb of ethylamine is 3.19. Calculate the pH of the base solution after the chemist has added 13.8 mL of the HNO3 solution to it. Round your answer to 2 decimal point places for final answer.