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A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 150.0 mL of KOH. The Kb of NH3 is 1.8 × 10^-5. A) 1.70 B) 6.44 C) 2.30 D) 7.56 E) 12.30