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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. 9.06 B. 9.45 C. 4.74 D. 4.55 E. 9.26