Transport of aspirin is expected to be faster in the . The speed of nonmediated absorption depends strongly on the polarity and charge of molecules. When p H is low (as it is in the ), the aspirin molecule will be and thus , due to of H+ in the solution. The higher pH is, the charged and polar will become the molecule, leading to the --- in the speed of absorption. One more evidence to this conclusion is that the pH in the is much lower than pKa of aspirin comparing to the pH of the .