Abstract
Saturation curves of caffeine monohydrate cf·H2O and of several complex compounds in the systems H2O–Cu[NO3]2–cf (I) and H2O–CuCl2–cf (II) have been determined at various temperatures. Solubility curves of cf·H2O in solutions of Cu[ClO4]2(III) and Cu[SO4](IV) have also been examined. A regular variation in behaviour of the four systems is observed. A model is proposed and empirical expressions for (I) and (II) are calculated which take into account two different factors affecting the solublization of caffeine by dilute solutions of copper(II) salts, i.e. complex-formation equilibria and the salting-out effect. A qualitatively very good agreement between the model and the experimental data is found. Thermodynamic quantities are also calculated.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call