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Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10^-5. A) 9.53 B) 9.25 C) 9.13 D) 8.98 E) 4.74