calculate the pH of 5M aqueous ammonia. Given kb=1.8 x 10^-5
........NH3 + H2O ==>NH4^+ + OH^-
I........5............0.......0
C.......-x............x.......x
E.......5-x...........x.......x
Substitute the E line into Kb expression and solve for x = OH^-, then convert to pH.