Asked by Patrick
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)?
Thank you.
Thank you.
Answers
Answered by
DrBob222
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.
.........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.
Answered by
gabriela
ph= 11.2
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