Thermometric determination of acid anhydrides in the presence of the parent acids

Abstract

A thermometric method is described for the determination of some carboxylic acid anhydrides. The anhydride is added to a methanolic solution of morpholine and the unreacted morpholine is titrated with a methanolic solution of hydrochloric acid. In most instances, the presence of large amounts of the parent acid has no effect on the determination and for 0·5 mmol of anhydride the accuracy is about ±1 per cent.