【摘要】 使用ＬＫＢ－２１０７型流动式微量热计测量了２８８．１５Ｋ，２９８．１５Ｋ和３０８．１５Ｋ下ＣａＣｌ_２－ｎ－Ｃ_３Ｈ_７ＯＨ－Ｈ_２Ｏ溶液的稀释热。混合溶剂中正丙醇摩尔分数Ｘα：０．００，０．１３，０．２５，０．５０，０．７５，０．８７和１．００。测量结果用扩展的Ｄｅｂｙｅ－Ｈｕｃｋｅｌ方程关联，计算了不同溶剂组成下溶液无限稀释热△Ｈ_Ｄ（ｍ＝０．５，Ｘα）。结果表明：Ｘα相同时，－△Ｈ_Ｄ随温度增加而增加；温度相同时，随Ｘα变化，当Ｘα≈０．８７时，－△Ｈ_Ｄ具最大值。更多还原

【Abstract】 Heat of dilution of CaCl₂-n-C₃H₇OH-H₂O solution has been determined with LKB-2107 flow microcalorimeter at 288. 15K, 298. 15K and 308. 15K. The mole fractions of n-propanol of the mixed solvents were 0. 00, 0. 13, 0.25, 0. 50, 0. 75, 0. 87 and 1. 00, respectively. The experimental results were correlated with an extended form of the Debye-Huckel equation. The parameters of the equation and the heat of dilution at infinite dilution at 0. 5 mol·kg-1 were calculated. The results obtained indicate that, increases with temperature at the same concentration of solvents, and -H changes with the concentration of the mixed solvents at the same temperature. The maximum values of is at 0. 87 mole fraction of n-propanol.更多还原