288.15～323.15K下氯化锂、硫酸锂溶液的密度及表观摩尔体积研究

摘要

Densities of aqueous solutions of LiC1 and Li2SO4 at solute molalities ranging from (0.03 to 18.9 or 3.0) mol · kg-1,respectively,have been measured by using vibrating-tube densitometer over the temperature ranges 288.15 ≤T/K≤323.15 at 0.1 MPa pressure.The apparent molar volumes of LiCI(aq) and Li2SO4 (aq) derived from these data were fitted using Pitzer ion interaction model.The volumetric ion interaction parameters of LiCl and Li2SO4 at different temperatures and their concentration and temperature dependences were determined.%用振荡管密度计测定了常压下,温度在288.15-323.15 K范围内不同离子强度的LiCl和Li2SO4溶液的密度,计算了两种锂盐在不同温度下的表观摩尔体积,溶液的浓度范围分别为(0.1 ～18.9)mol·kg-1及(0.03～3.0) mol·kg-1.用Pitzer离子相互作用模型拟合了LiCl和Li2SO4不同温度下的的Pitzer单电解质体积参数,模型的计算值与实验值相吻合良好.