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Applications of Colloids

In an amino a...

Question

In an amino acid, the carboxylic group ionises at $p K_{a 1} = 2.34$ and ammonium ion at $p K_{a 2} = 9.60$ . The isoelectric point of the amino acid is at pH

A

5.97

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B

2.34

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C

9.60

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D

6.97

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Solution

The correct option is A 5.97
A certain pH at which the concentration of the dipolar ion is at its maximum and the concentrations of the anions and cations are equal is called isolelctric point.

Given:
$p K_{1} = 2.34$
$p K_{2} = 9.60$

$p I = \frac{p K_{1} + p K_{2}}{2}$

$p I = \frac{2.34 + 9.60}{2}$

$p I = \frac{11.94}{2}$

$p I = 5.97$

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