Codeine (C18H21NO3) is a narcotic pain reliever that forms a salt with HCl. What is the pH of 0.064 M codeine hydrochloride (pKb of codeine is 5.80)?

Question

Thank you.

Answer 1

Let's call codeine hydrochloride CHCl which makes the cation CH^+ and the anion Cl^-
.........CH^+ + H2O ==> H3O^+ + C
I......0.064.............0......0
C........-x..............x......x
E.......0.064-x
Convert pKb to Kb
Kb for the base = (Kw/Ka for the hydrochloride) = (x)(x)/(0.064-x)
Solve for x. Post your work if you get stuck.

Answer 2

ph= 11.2