The pH at which the maximum hydrate is presen | vedclass

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(A) The formation of the hydrate of a carbonyl group is favored in acidic media.For oxaloacetic acid,the carbonyl group is most susceptible to nucleop

Vedclass · Accepted Answer

$pH = 0$

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(A) The formation of the hydrate of a carbonyl group is favored in acidic media.For oxaloacetic acid,the carbonyl group is most susceptible to nucleophilic attack by water when the molecule is in its protonated (neutral) form.As the $pH$ increases,the carboxylic acid groups deprotonate,increasing the electron density on the molecule through inductive effects,which destabilizes the hydrate.Therefore,the maximum concentration of the hydrate is observed at a $pH$ lower than the $pK_a$ values of the carboxylic acid groups.Among the given options,$pH = 0$ provides the most acidic environment,favoring the formation of the hydrate.

The $pH$ at which the maximum hydrate is present in a solution of oxaloacetic acid $(HOOC-CO-CH_2-COOH)$ with $pK_{a1} = 2.2$ and $pK_{a2} = 3.98$ is:

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