What Is the PH of a Solution That Results When $\times$

Multiple Choice

What is the pH of a solution that results when 0.010 mol HNO₃ is added to 500.mL of a solution that is 0.10 M in aqueous ammonia and 0.55 M in ammonium nitrate.Assume no volume change.(The K_b for NH₃ = 1.8 $\times$ 10^-5. )

A) 9.26
B) 5.05
C) 10.11
D) 8.40
E) 8.71