Chemistry
posted by Chris on .
Diethylamine (C2H5)2NH, is a weak base that ionizes in water,a 0.600 M solution of (C2H5)2NH is 4.65% ionized at 25 degrees Celsius.
Calculate the pH of the solution.
Calculate the Kb for diethylamine.

Let's call diethylamine simply BNH.
.......BNH + HOH ==> BNH2^+ + OH^
I.....0.600...........0........0
C........x............x........x
E......0.600x........x.........x
%ionization = 4.65%; therefore,
x = (BNH^+) = (OH^) = 0.600 x 0.0465
pOH = log(OH^) and yo have OH^
Then pH + pOH = pKw = 14. You have pOH and 14, solve for pH.
Then substitute the values in the E line into Kb expression and solve for Kb.