氯化锂-乙醇-水溶液稀释热  

HEAT OF DILUTION OF LiCl/C 2H 5OH H 2O SOLUTION

作　　者：张雅明[1] 曹庆扬[1] 牛学寨 王延儒[1] 时钧[1] 

机构地区：[1]南京化工大学化工学院,南京210009

出　　处：《南京化工大学学报》1999年第4期39-43,共5页Journal of Nanjing University of Chemical Technology(Natural Science Edition)

摘　　要：使用 Ｌ Ｋ Ｂ ２１０７ 型流动式微量热计微机数据采集系统测量了 ２８８．１５ Ｋ、２９８．１５ Ｋ 和 ３０８１５ Ｋ 下 Ｌｉ Ｃｌ Ｃ２ Ｈ５ Ｏ Ｈ Ｈ２ Ｏ 体系在不同混合溶剂浓度下的稀释热。测量结果用扩展的 Ｄｅｂｙｅ Ｈüｃｋｅｌ方程、 Ｐｉｔｚｅｒ 模型和单参数模型关联。计算了方程的参数和溶液无限稀释热（ｍ Ｌｉ Ｃｌ＝ １．０ ｍ ｏｌ／ｋｇ 溶剂）－ Δ Ｈ Ｄ∞ 。结果表明：相同混合溶剂浓度下，－ Δ Ｈ Ｄ ∞ 随温度增加而增加；同一温度下，－ Δ Ｈ Ｄ∞ 与溶剂浓度有关，在 ｘ２ ＝ ０．８５ 左右，－ Δ Ｈ Ｄ∞ 具有最大值。The heat of dilution of LiCl C 2H 5OH H 2O solution has been measured with LKB 2107 flow microcalorimeter with PC Data Acquisitor system at 288.15 K,298.15 K and 308.15 K. The experimental results were correlated using the extended form of the Debye Hückel limiting law,the ion interaction model of Pitzer and the single parameter model. The molar enthalpies of dilution at infinite dilution of LiCl( m LiCl =1.0 mol/kg)for fixed composition of the mixed solvent were obtained. The results indicate that, -Δ H ∞ D increases with temperature at the same concentration of solvents, and -Δ H ∞ D changes with the concentration of solvents at the same temperature. The maximum value of -Δ H ∞ D is at 0.85 mole fraction of alcohol.

关 键 词：稀释热 乙醇 氯化锂 水 溶液 电解质 

分 类 号：O646.1[理学—物理化学]