The pH of a solution of ammonia, NH3, is measured at equilibrium and found to be 11.48. Given that Kb for NH3 is 1.8 X 10?5, what was the initial (before equilibrium) concentration of NH3?
A) 0.51 M
B) 1 1.0 X 10?1 M
C) 1.0 M
D) 2.4 X 10?1 M
E) 5.6 X 10?10 M