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An analytical chemist is titrating 222.7 mL of a 0.8000 M solution of dimethylamine ((CH3)2NH) with a 0.09200 M solution of HIO3. The pKb of dimethylamine is 3.27. Calculate the pH of the base solution after the chemist added 2100.2 mL of HIO3 solution to it. Round your answer to 2 decimal places.