Esterification using carboxylic acid andalcohol requires an acid catalyst.In an experiment the acid form ofan ion-exchange resin is used. This resin, in the form of smallbeads, is a cross-linked polystyrene that bears sulfonic acidgroups on some of the phenyl groups.Basically it is an immobilizedform of p-toluenesulfonic acid, an organic-substituted sulfuricacid. What advantage does this catalyst have over using concentrated sulfuric acid?