A buffer was prepared by mixing 0.200 moles of ammonia (Kb= 1.8×10-5) and 0.200

Question

 

A buffer was prepared by mixing 0.200 moles of ammonia (Kb= 1.8×10-5) 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?

8.18
8.38
8.53
8.78
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