MeOH-H_2O-NaOAc体系(278.2～318.2K)的电导研究

Conductance Study of MeOH-H_2O-NaOAc Systems in 278.2～318.2K

本文测定了278.2～318.2K间的五个温度下七种浓度的NaOAc分别在10,20,30,40,50,60,70,80,90及100％MeOH-H_2O体系中的摩尔电导,并应用FOS,Pitts,L-W,F-78等四个电导方程对实验数据进行了拟合处理,得到了三个拟合参数_0,K_A及R(或α)。最后,对四个方程与实验的吻合程度,温度、溶剂组成等对_0、K_A的影响规律及溶质-溶剂相互作用进行了讨论。

The molar conductances of NaOAc in 10～100％ weight percent methanol aqueous at 278.2, 288.2, 298.2, 308.2 and 318.2K are determined in this work. The four groups of best fitting parameters, such as the limitting molar conductance _0, the ions association constant K_A and the distance parameter R(or a)are evaluatod from Fuoss-Onsager-Skinner, Pitts, Lee-Wheaton and Fuoss-1978 conductance equations, respectively, A discussion about the applicability of the four conductance equations, the dependence of _0, K_A, the walden product _(0η) and the ion-solvent interactions on temperature and the weight percent of methanol in the systoms are given.