Ibuprofen (aka ADVIL) is a weak acid with a pKa of 4.9. It is absorbed through the stomach and the small intestine as a function of polarity - charged and very polar molecules are absorbed slowly; neutral hydrophobic molecules absorb quickly. If the stomach pH is about 1.5 and the small intestine pH is about 6, where (and why) will more ibuprofen be absorbed into the bloodstream

Explanation:

There will be absorption of more ibuprofen in the stomach due to the fact that  it will be uncharged because the pH is lower than the pKa.

The molecular formula for Ibuprofen is: C₁₃H₁₈O₂

The IUPAC name is:

(RS)-2-(4-(2-methylpropyl)phenyl)propanoic acid

From the attached image, we will see the structural formula of Ibuprofen.

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