15) Draw the structure of aspartic acid at pH of 1, 3, 6, and 11. The pKa of the amino group is 9.90. The pK$_a$ of the R group is 3.90. The pK$_a$ of the C-terminal carboxylic acid is 1.99.
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This means that both the amino group and the R group will be protonated, while the carboxylic acid group will remain deprotonated. The structure of aspartic acid at pH 1 would look like this: NH3+ - CH2 - CH - COO- At pH 3.6, the solution is still acidic but Show more…
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