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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。
This paper presents a new method to calculate the number of ionic hydration. Robinson-Stokes correction factors were fitted by computer. Got a common correction factor formula. The volume of hydration layer of various ions and the molar volume of water in the hydration layer were obtained by using the limit-equivalent conductance and the partial molar volume data at infinite dilution, respectively, and the hydration number of ions was obtained. The results obtained in this paper are basically consistent with those obtained by migration number method. We found that there is an approximate linear relationship between the hydration volume of alkali metal ions and alkaline earth metal ions and the cube of the crystal radius of the ions.