当量电导—偏摩尔体积法计算离子水合数

本文提出了一种新的计算离子水合数的方法。用计算机拟合了Robinson-Stokes校正因子。得到了通用的校正因子公式。并用极限当量电导和无限稀释时的偏摩尔体积数据,分别求得了各种离子的水合层体积和水合层中水的摩尔体积,进而得到了离子的水合数。本文计算结果与迁移数法得到的结果基本一致。我们发现碱金属离子和碱土金属离子的水合体积与离子的晶体半径的立方有近似的线性关系。

Calculation of Hydration Numbers From Conductance and Partial Molal Volme

A new method was proposed for the calculation of ionic hydratioa numbers from equivalent conductance and partial molal vloume of the ions.The method has two major improvements compared to the existing conductance met hods . F irst ,a polynomial representation of Robinson and Stokes correction factor was obtained by computer regrss ion. Second, an expression of the molar volume of water in the hydration shell around an ion was der ived. Hydrat ion numbers of monovalent , bivalent and trivalent ions were calculated and the results were in good agreement with those determined by transference method.