At a physiological pH of 7.4, amino acids exist as zwitterions. At a very low pH (in an acid solution) , both the amine group and the carboxylic acid group on an amino acid are protonated. Which acid group is the stronger acid?
A) -NH2
B) -NH3+
C) -COOH
D) -COO-
E) -H3O+
Correct Answer:
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