应用离子选择性电极进行溶液热力学研究——Ⅳ.氯化钠在5—45℃间九个温度下由水至二甲基甲酰胺-水混合溶剂的标准转移Gibbs自由能及转移熵的测定

Using Ion-Selective Electrodes to Study the Thermodynamics of Solution——Ⅳ.The Standard Gibbs Free Energies and Entropies of Transfer of Sodium Chloride from Water to N,N-Dimethylformamide—Water Mixture at Nine Temperatures from 5℃ to 45℃

本文应用钠离子玻璃电极及氯离子选择性电极组成无液界可逆电池,即Cl选择电极|NaCl(m),w或s|Na+玻璃电极测定电池的标准电动势.

The standard electromotive forces of the reversible cells without liquid junctionconsists of the sodium ion glass-electrode and chloride selective electrode,namelyCl-selective electrode|NaCl(m),w or s|Na+glass-electrode have been measured,andthe standard Gibbs free energies of transfer of NaCl from water to N,N-dimethylfor-mamide—water mixtures have been calculated.The standard transfer entropies have beenalso calculated from temperatures coefficient of△Gt°at nine temperatures from 5℃to 45℃.The behaviour of the change of△Gt°and△St°with organic composition andtemperature,the change of solvations of NaCl from the pure water to mixed solvents andthe structure of the liquid studied were discussed.