The two pKas of a simple amino acid (i.e., side chain does not ionize) are 1.99 and 9.48 for the a-carboxyl and a-aminium groups, respectively. At pH 1.9, what percentage of amino acid molecules are in the zwitterion form? Enter your answer to the nearest ones.

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The two PK₂s of a simple amino acid (i.e., side chain does not ionize) are 1.99 and 9.48 for
the a-carboxyl and a-aminium groups, respectively. At pH 1.9, what percentage of amino
acid molecules are in the zwitterion form? Enter your answer to the nearest ones.
45
Transcribed Image Text:The two PK₂s of a simple amino acid (i.e., side chain does not ionize) are 1.99 and 9.48 for the a-carboxyl and a-aminium groups, respectively. At pH 1.9, what percentage of amino acid molecules are in the zwitterion form? Enter your answer to the nearest ones. 45
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