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In the titration of 25.0 mL 0.100 M NH3 with 0.100 M HCl, what is the pH after 15.0 mL of the HCl solution has been added? (Kb NH3 = 1.8 ×10^-5) A) 9.00 B) 11.13 C) 4.00 D) 9.08 E) 8.42