The thermodynamic equation for the dissolution of solids in liquids.

✍ Scribed by G.E. Yakubov; V.I. Boiko

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 766 KB
• Volume: 91
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(01)00142-8

✦ Synopsis

A solvation model of a superficial layer on the liquidsolid interface is given. This model is applied for the description of the dissolution of solid compounds in liquids. The superficial layer is supposed as a solid solution of a solvent in a solute of non-stoichiometric composition. It is described within the scope of the Debye model of a solid state. A peculiarity of the model is that the Debye temperature of the solid solution is a function of the partial densities of the solvent and the solute. The solvation effect is taken into account by using one constantthe Gruneisen solvation constant. For the temperature dependence and for the heat of dissolution analytical expressions are obtained. The expressions are functions of the Debye characteristic temperature and the Gruneisen solvation constant of a superficial layer. Thorough comparison with the experiments on the dissolution and the heat of dissolution of the metals in liquid mercury is performed yielding excellent agreement.