A PH 956 Buffer Was Prepared by Mixing 2

Multiple Choice

A pH 9.56 buffer was prepared by mixing 2.00 moles of ammonia (Kb for ammonia is 1.8 × 10^-5) and 1.00 mol of ammonium chloride in water to form a solution with a volume of 1.00 L. To a 200.0 mL aliquot of this solution was added 10.0 mL of 10.0 M sodium hydroxide. What was the resulting pH?

A) 9.28
B) 9.56
C) 9.95
D) 10.50
E) 13.7