摘要
提出了 1个电解质溶液的热力学模型 ,它由两步组成 ,即电解质与溶剂的混合和电解质在溶剂中的电离 .据此 ,导得了电解质离子的平均活度系数和溶剂 (水 )的渗透系数方程 .并能方便地推广到混合电解质溶液 .用实验数据广泛检验结果表明 ,这个模型能很好地适用于较高浓度下的强电解质溶液 .
A new excess Gibbs free energy model of strong electrolyte solutions,which consists of the mixing of electrolyte molecule and solvent and the ionization of electrolyte molecule in the solvent,is proposed.The model is composed of two contributions,one due to long-range forces,represented by the Debye-Hückel theory,and the other due to short-range forces,represented by the modified van Laar theory.According to this model,the equations of the ionic mean activity coefficient and the osmotic coefficient of solvent with three adjustable parameters are derived,and they can be easily extended to the mixed electrolyte solutions.The calculation results of the ionic mean activity coefficients for 66 strong electrolyte aqueous solutions over 0-6 molality demonstrate that the consistency with experimental values is superior to two local composition models proposed by Chen and Haghtalab et al respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第3期281-287,共7页
CIESC Journal
