高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (9): 1234.

• 论文 • 上一篇    下一篇

混合溶剂中标准pH参考值的研究--KHPh(0.05 mol/kg)+KCl+异丙醇+水体系

蒋湘顺, 梁春馀, 秦美洁   

  1. 辽宁大学化学系, 沈阳, 110036
  • 收稿日期:1990-05-16 出版日期:1991-09-24 发布日期:1991-09-24
  • 通讯作者: 蒋湘顺

Studies on Standard pH Reference Values in Mixed Solvents--The System of KHPh(0. 05 mol/kg)+KCl+Isopropanol+Water from 278. 15 to318. 15 K

Jiang Xiang-shun, Liang Chun-yu, Qin Mei-jie   

  1. Department of Chemistry, Liaoning University, Shenyang, 110036
  • Received:1990-05-16 Online:1991-09-24 Published:1991-09-24

摘要: 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。

关键词: 标准pH参考值, 邻苯二甲酸氢钾, 异丙醇, 电离常数, 电离热力学

Abstract: pHstandard reference values, pH(RVS), for 0. 05 mol/kg potassium hydrogen phthalate buffer solutions in 10%, 14. 93% and 20% isopropanol+ water mixed solvents at temperatures from 278. 15 to 318. 15 Kare determined from reversible electromotive potential measurements of the cell without a liquid junction. On the basis of Pitzer's theory, a new method for determining the activity coefficients of each ion in the solutions is proposed. The second thermodynamic dissociation constants of v-phthalic acid are calculated, and the thermodynamic quantities of the second dissociation are calculated and the results are discussed.

Key words: Standard pH reference values. Potassium hydrogenphthalate, Isopropanol. Dissociation constant, Thermodynamics of dissociation

TrendMD: