At 25 ^$\circ$ C, the Base Ionization Constant for NH₃ Is 1

Multiple Choice

At 25 ^$\circ$ C, the base ionization constant for NH₃ is 1.8 * 10^-5. Determine the pH of a solution prepared by adding 0.0500 mol of solid ammonium chloride to 100. mL of 0.150 M ammonia.

A) 3.47
B) 8.73
C) 10.4
D) 12.3
E) None of the above