Oxycodone (C18H21NO4), a narcotic analgesic, is a weak base with pKb = 5.47. Calculate the pH of a .00500 M oxycodone solution.

pH = 10.11

Explanation:

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In this case, since it is possible to realize that this base is able to acquire one hydrogen atom from the water:

We can therefore set up the corresponding equilibrium expression:

Which can be written in terms of the reaction extent, :

Thus, by solving for we obtain:

However, since negative solutions are now allowed, we infer the correct is 0.0001285 M; thus, the pOH can be computed:

And finally the pH:

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