Determination of Base Dissociation Constants (Pkb) of Mono- and Polyamines by pH Metric Method

Abstract

Dissociation constants of acids and bases (pK_a and pK_b) are very important criteria to define the strength of acids or bases. In organic chemistry acids generally the compounds that contain –COOH group and bases are amines and their derivatives. This paper presents the study of pK_b of about 20 organic amines. pK_b determination is done pH metrically which is a very simple method for this type of study. pK_b of some of the reported amines are already determined by various researcher by using different methods. Most of the amines reported in this paper are studied fist time for pK_b study. It is found that those amines which are studied for pK_b value and available in the literature, give almost same result with presented corresponding values. Some of the amines (bases) are common but most of the amines are uncommon and they are used for a very specific purpose. pK_a value is used in many cases to solve connecting problems. These pK_b values can be used for research and other purposes. This paper presents the pK_a/pK_b determination of mono-(one amino group), di-(two amino group), tri-(three amino group) and tetra (four amino groups) amines, which will be a very good work for others for research purposes.