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  4. Consider the following sequence for aspartic acid: The pI (isoelectric point) of aspartic acid is :

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Q. Consider the following sequence for aspartic acid :
The pI (isoelectric point) of aspartic acid is :Chemistry Question Image

JEE MainJEE Main 2016

Solution:

$PH=\frac{pK_{1}+pK_{2}}{2}$
$=\frac{1.88+3.65}{2}$
$=\frac{5.53}{2}$
$=2.765 \approx 2.77$
At Isoelectric point of Aspartic Acid both carboxylic as well as amino from co-exist.