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Thanks for your help! Your hints gave me a better understanding of the question.

Homework Statement The antimalarial drug quinine has pka = 8.4; is it likely to be absorbed by passive diffusion through lipid membranes in the stomach (ph = 0.9) or ileum (ph \approx 8)? Why? Homework Equations n/a The Attempt at a Solution If the pH of the environment is...