Apelblat Alexander, Bester-Rogac Marija, Barthel Josef, Neueder Roland
Department of Chemical Engineering, Ben Gurion University of the Negev, Beer Sheva 84105, Israel.
J Phys Chem B. 2006 May 4;110(17):8893-906. doi: 10.1021/jp057371s.
A general approach is proposed to analyze electrical conductivities in aqueous solutions of polybasic organic acids. Experimental conductivities are examined in the context of dissociation and hydrolysis reactions by applying the Quint-Viallard conductivity equations and the Debye-Hückel equations for activity coefficients. The proposed numerical procedure is illustrated by the case of benzenehexacarboxylic (mellitic) acid and its neutral and acidic salts. From conductivity measurements of mellitic acid and its salts, performed in dilute aqueous solutions in the 278.15-308.15 K temperature range, the limiting conductances of mellitic anions, lambda(0)(1/jH(6-j)Mel(-j), T), j = 1, 2, 3, 4, 5, 6 are determined.
提出了一种分析多元有机酸水溶液电导率的通用方法。通过应用昆特 - 维亚拉尔导电率方程和德拜 - 休克尔活度系数方程，在离解和水解反应的背景下研究实验导电率。以苯六甲酸（均苯四甲酸）及其中性和酸性盐为例说明了所提出的数值程序。通过在278.15 - 308.15 K温度范围内的稀水溶液中对均苯四甲酸及其盐进行电导率测量，确定了均苯四甲酸阴离子λ(0)(1/jH(6 - j)Mel(-j), T)，j = 1, 2, 3, 4, 5, 6的极限电导率。
