Thermometric titration of amines in non-aqueous media with antimony pentachloride

Abstract

A thermometric titration method in non-aqueous media is proposed for the assay of amines viz., triethylamine, isopropylamine,<em> n</em>-propylamine, di-<em>n</em>-propylamine, tri<em>-n-</em>propylamine, <em>n</em>-butylamine, di-<em>n</em>-butylamine, tri-<em>n</em>-butylamine, piperidine, pyridine and aniline in 1,2- dichloroethane solvent at room temperature with antimony pentachloride as the titrant. The method was found to be highly accurate, having a relative standard deviation of &lt; 1.0%. The mean recovery values show that antimony pentachloride is a good titrant. However, addition of two drops of acetic anhydride in the amine solution improves the titration curve and the mean recovery value of the amine generally in all titrations. The recovery values indicate that antimony pentachloride does not have any a steric hindrance as a titrant.