Calculate the pH of a 1.0 M solution of NH4Cl with the following parameter given:
Kb=1.8 x 10^-5 for NH3
Alright, this is a conceptually tough one, if you are not very good with recognizing conjugate species. As I suspect, you know that ammonia and ammonium are related. The relationship is that the ammonium is the conjugate acid of ammonia.
They are related by one hydrogen ...
This solution gives the pH level, with certain parameters given. The parameters for NH4Cl solutions are given.