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A buffer was prepared by mixing 0.200 moles of ammonia (Kb = 1.8x10^-5) and 0.200 moles of ammonium chloride to form an aqueous solution with a total volume of 500 mL. 250 mL of the buffer was added to 50.0 mL of 1.00 M HCl. What is the pH of this second solution? a) 8.18 b) 8.38 c) 8.78 d) 8.53