Partial Molar Volumes of Organic Compounds in Water: Part 4.—Aminocarboxylic Acids

Abstract

The partial molar volumes of the a,a>-aminocarboxylic acids up to 11-aminoundecanoic acid, together with those of a number of cyciopentane and cyclohexane analogues, have been measured in water at 25'C, and related to their van der Waals volumes. Similar studies of the isomeric <■;- hydroxyalkyl amides have allowed an estimation of the electrostriction arising from the interaction of the charges with the solvent, and the individual contributions due to the carboxylate and alkylammonium ions have been deduced. The application of these values to the calculation of partial molar volumes for aminocarboxyiic acids, assuming the spherical model previously described, is illustrated.