Q.

The pH at the half-equivalence point of titration of the Zwitter ion of  valine is 9.714 with NaOH and 2.286 with HCl, Thus, its isoelectric pH is …..

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answer is 6.

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Detailed Solution

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Isoelectric pH is the pH at which there is no migration of Zwitter ion on passing electric current
 pH =pH(with NaOH)+pH(with HCl)2 =9.714+2.2866=6

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