氟化钠及氯化钠由水至水与二氧六圜混合溶剂的标准转移Gibbs能及活度系数的测定——应用离子选择电极研究溶液热力学

本文应用钠离子玻璃电极分别和氟离子及氯离子选择性电极组成无液接界可逆电池Na~+玻璃电极| MX(m) | |H_2O或混合溶剂|X~-选择性电极测定电池在NaF-H_2O-1,4-(CH_2)_4O_2(二氧六圜)及NaCl-H_2O-1,4-(CH_2)_4O_2体系的标准电动势, 计算NaF及NaCl由水至水-二氧六圜混合溶剂的转移Gibbs能及盐在不同组成溶液中的活度系数。并将NaCl-H_2O-1,4-(CH_2)_4O_2体系的△E_t~·的测定值与文献值进行比较, 结果进一步表明应用离子选择性电极进行溶液热力学研究是可靠的, 此外, 将本文的结果与以前的工作比较, 讨论了溶剂对△G_t°的影响。

THE STANDARD GIBBS ENERGIES OF TRANSFER AND THE ACTIVITY COEFFICIENTS OF NaF AND NaCl FROM WATER TO DIOXAN+WATER MIXTURES——USING IONSELECTIVE ELECTRODES TO STUDY THE THERMODYNAMICS OF SOLUTIONS

The reversible cell without liquid junction consists of the sodium ion glass- electrode and fluoride or chloride selective electrodes respectively, namely Na~+ glass-electrode | MX(m) | | w or s | X~- selective electrodeThe standard electromotive forces of the cells have been measured in NaF- H_2O-Dioxan and NaCl-H_2O-Dioxan systems, then the standard Gibbs energies of transfer of NaF and NaCI from water to Dioxan-Water mixtures and the activity coefficients have been calculated. The measured values of △E°_t for NaCl-H_2O-Dioxan systems have been compared with literature results. It indicated that the use of ion selective electrodes to study the thermodynamics of solution is reliable, also, the results of this paper have been compared with those of previous works. This influences of solvents on ΔG_t° have also been discussed.