Phenylephrine (PE; See the Structure Below)is a Nasal Decongestant and Is

question 212

Multiple Choice

Phenylephrine (PE; see the structure below) is a nasal decongestant and is the active ingredient in Sudafed,which contains phenylephrine hydrochloride (PEHCl) .This conjugate acid of phenylephrine (PEH⁺) has a pK_a = 5.5.At a physiological pH of 7.4,what is the ratio of concentrations,[PE]/[PEH⁺]?

• A)6.7
• B)0.01
• C)0.14
• D)79
• E)21

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