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 pKa = 5.5. At a physiological pH of 7.4. what is the ratio of concentrations, [PE]/[PEH+]? ![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<sup>+</sup>) has a pK<sub>a </sub>= 5.5. At a physiological pH of 7.4. what is the ratio of concentrations, [PE]/[PEH<sup>+</sup>]? A) 6.7 B) 0.01 C) 0.14 D) 79 E) 21](https://d2lvgg3v3hfg70.cloudfront.net/TB3833/11eaae02_0891_77f6_95d8_93f83ee99a85_TB3833_00.jpg)
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A statistical measure used to describe the dispersion or variation of a set of data points by squaring their deviations from the mean.
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