Lysine contains two amine groups (pKa values of 9.0 and 10.0) and a carboxylic acid group (pKa 2.2) . In a solution of pH 9.5, which of the following would best describe the protonation and charge state of lysine?
A) carboxylic acid: deprotonated and neutral; both amines: protonated and positive
B) carboxylic acid: deprotonated and negative; both amines: deprotonated and neutral
C) carboxylic acid: deprotonated and negative; amine (pKa 9.0) : deprotonated and neutral; amine (pKa 10.0) : protonated and positive
D) carboxylic acid: deprotonated and negative; amine (pKa 9.0) : protonated and positive; amine (pKa 10.0) : deprotonated and neutral
E) carboxylic acid: deprotonated and neutral; amine (pKa 9.0) : deprotonated and neutral; amine (pKa 10.0) : protonated and positive
Correct Answer:
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