Q13 / 90 · JEE Main 2016 (09 Apr Online) · Chemistry

Consider the following sequence for aspartic acid:

The pH (Isoelectric point) of aspartic acid is:

A
3.65
Correct answer
B
2.77
C
5.74
D
1.88

Solution

p H = \frac{p K_{1} + p K_{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 and amino from co-exist.

Hence, the correct answer is option: 'B'.

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