Solubility of Ethylenediamine D-Tartrate in Water

Abstract

IN a recent paper¹, A. C. Walker has given tables and curves for the solubility–temperature relationship in the system ethylenediamine D-tartrate (anhyd.)–ethylenediamine D-tartrate monohydrate–water. Dr. Walker shows that the salt decomposes slowly in solution, and the consequent change of composition of the solute during the time taken by the solubility determinations introduces some uncertainty in the results. Usually, when preparing a solubility curve, a considerable time must be allowed, at each observed temperature, for equilibrium between solution and solute to be attained. The change of composition of the solute during the experiments is probably responsible for the difference in level, of the order of 1° C., in two of the published curves.