The structure of aspartic acid is given below
(A) .

The pKa₁, pKa₂, and pKa₃ of (A), respectively, are:1.88, 3.65 and 9.60. pKa₁corresponds to the ionization of the COOH group, of
. pKa₂ corresponds to the ionisation of $(\begin{matrix} + \\ {NH}_{3} \end{matrix})$ (ammonium ion). What is the pH at isoelectric points (pI)?

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$\frac{{pK}_{a_{2}} + {pK}_{3}}{2}$

$\frac{{pK}_{a_{1}} + {pKa}_{3}}{3}$

$\frac{{pK}_{a_{1}} + {pKa}_{2}}{2}$

$\frac{{pK}_{a_{1}} + {pKa}_{2} + {pKa}_{3}}{3}$

answer is A.

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Detailed Solution

The pK_a value indicates the strength of an acid. pK_a is the negative log of the acid dissociation constant or Ka value. A lower pK_a value indicates a stronger acid. If there are more than one carboxylic group then we will take the average of pK_a of carboxyl groups $pH = \frac{{pK}_{a_{1}} + {pKa}_{2}}{2}$ Hence, the correct options is(1)