<prompt> A pharmacologist is determining the pharmacokinetic parameters of a novel antibiotic in order to determine the proper dosage. The drug is a weak organic acid with a pKa of 3.0. Assuming a pH of 2.0 in the stomach, approximately what percent of the drug will be in a form that can be rapidly absorbed from the stomach?60509990  <response>: First, it is necessary to know that it is the uncharged, lipid-soluble form that can be rapidly absorbed. For an acid: HA H A-. Therefore, the protonated form is uncharged. The Henderson-Hasselbalch equation is: pH pKa - log In this case, 2.0 3.0 - log 1.0 log 10 HAA- 101 HAHA A- 1010 1 91, or approximately 90 