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Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 200.0 mL of 0.12 M NH3. The Kb for NH3 is 1.8 × 10^-5. A) 4.74 B) 9.06 C) 9.45 D) 4.55 E) 9.26