A Certain Weak Base B Has a Base-Ionization Constant K_b $\times$

Multiple Choice

A certain weak base B has a base-ionization constant K_b of 7.3 $\times$ 10^-4 at 25°C.If strong acid is added to a solution of B,at what pH will [B] = [BH⁺]?

A) 8.5
B) 10.9
C) 7.0
D) 3.1
E) 5.5