In following the acid-catalysed hydrolysis of an ester by titrating equal aliquots with standard NaOH, the titre at infinite time ( $V_{\infty}$ ) corresponds to

Athe acid formed from half of the ester plus the catalyst
Bthe carboxylic acid formed by complete hydrolysis plus the mineral acid catalyst
Cthe mineral acid catalyst alone
Dthe unreacted ester only

Answer: B

The catalyst acid is present throughout and gives

V_{0}

. After complete hydrolysis all the ester has become carboxylic acid, which adds to the catalyst, so

V_{\infty}

= catalyst + total acid formed.