Question

what is the pH of .10 M NH4CL?

Answer 1

The hydrolysis of the NH4^+ is what determines the pH of the solution.

..........NH4^+ + H2O ==> NH3 + H3O^+
I..........0.1.............0.....0
C...........-x.............x.....x
E.........-0.1-x...........x.....x

Ka for NH4^+ = (Kw/Kb for NH3) = (x)(x)/(NH4^)
Substitute and solve for x = (H3O^+), then convert to pH.