物理化学学报 >> 1987, Vol. 3 >> Issue (03): 258-264.doi: 10.3866/PKU.WHXB19870308

研究论文 上一篇    下一篇

定标粒子液体理论应用于极性溶质体系及其盐效应系数的计算

谢文蕙; 杨伟涛   

  1. 北京大学化学系
  • 收稿日期:1986-01-16 修回日期:1986-07-09 发布日期:1987-06-15

APPLICATION OF A SCALED PARTICLE THEORY TO POLAR SOLUTE SYSTEM AND CALCULATION OF THE SALT EFFECT CONSTANT

Xie Wenhui; Yang Weitao   

  1. Department of Chemistry; Peking University
  • Received:1986-01-16 Revised:1986-07-09 Published:1987-06-15

摘要: 1970年W. L. Masterton和T. P. Lee将定标粒子理论应用于非极性溶质在电解质水溶液中的盐效应系数的计算, 推导出便于应用的盐效应表达式。本文将定标粒子理论应用于极性溶质, 推导出一个求极性溶质的盐效应常数表达式。
作者用此表达式分别计算了乙酸、正丙酸、正丁酸、正己酸及正庚酸各在KCl、KBr、NaCl和NaBr四种小离子盐水溶液中的理论盐析常数。修正后的盐析常数比用Masterton和Lee公式计算的盐析常数更接近实验值。

Abstract: In 1970, W. L. Masterton and T. P. Lee applied the scaled particle theory to nonpolar solute system, and drived an applicable formula of salting-out con- stant. This work has tried to apply the scaled particle theory to polar solute system, and drived a formula of salting-out constant for polar nonelectrolyte.
The k_s values of CH_3COOH, n-CH_3CH_2COOH, n-CH_3(CH_2)_2COOH, n-CH_3(CH_2)_4-COOH, and n-CH_3(CH_2)_5COOH in four small ion aqueous salt solutions were calcu- lated. The modified formula gave the results in better agreement with the experiment than the original formula.