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The first thermodynamic dissociation constants of o-phthalic acid were determined at five temperatures from 278.15 to 318.15 K in 10, 14.93 and 20 wt% isopropanol-water solvent mixtures, by precise e. m. f. measurements of hydrogen-silver chlorld electrodes in cells without liquid junction. On the basis of Pitzer's theory, the method of polynomial approximation was used to determine the dissociation constants of H_2P and the results obtained were compared with traditional extrapolation according to the extended Debye-Huckel equation Results obtained from both methods agree within experimental error. The dependence of the first thermodynamic dissociation constant on temperature was given as a function of the thermodynamic temperature T by the empirical equation: pK_1=A_0+A_1/T+A_2/T. The thermodynamic quantities of dissociation in the mixed solvents have been calculated, and the results have been discussed. 相似文献
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本文在278.15~318.15K温度范围内测定了Ag-AgCl电极在10和20wt%异丙醇+水混合溶剂中的标准电极电势,根据Pitzer理论计算和讨论了HCl在混合溶剂中的平均活度系数和电离热力学性质。 相似文献
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应用电动势法在10%,15%和20%异丙醇-水混合溶剂中测定了0.05mol/kg邻苯二甲酸氢钾缓冲溶液在278.15-318.15K范围内的标准PH参考值,讨论了溶剂组成和温度对PH的影响。 相似文献
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应用电动势法在10%、14.93%和20%异丙醇+水混合溶剂中测定了0.05mol/kg邻苯二甲酸氢钾(KHPh)缓冲溶液在278.15~318.15K范围内的标准pH参考值,根据Pitzer理论,提出了确定各离子活度系数的新方法,计算了邻苯二甲酸的第二级热力学解离常数和相应的热力学量。 相似文献
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