Calculate the PH of a Solution Made by Mixing 100 $\times$

Multiple Choice

Calculate the pH of a solution made by mixing 100.0 mL of 0.635 M NH₃ with 100.0 mL of 0.100 M HCl.(K_b for NH₃ = 1.8 $\times$ 10^-5)

A) 9.98
B) 4.02
C) 8.53
D) 9.26
E) none of these