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Question

In an amino acid, the carboxylic group ionises at pKa1=2.34 and ammonium ion at pKa2=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:
pK1=2.34
pK2=9.60

pI=pK1+pK22

pI=2.34+9.602

pI=11.942

pI=5.97

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