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Isopiestic Determination of the Osmotic Coefficients and Pitzer Model Representation for the Li2B4O7+LiCl + H2O System at T=298.15 K

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Abstract

Isopiestic molalities and water activities have been measured for the Li2B4O7+LiCl + H2O system at T=298.15 K using an improved isopiestic apparatus. Two types of osmotic coefficients, φ S and φ E, were determined, where φ S is based on the stoichiometric molalities of the solute Li2B4O7(aq) and φ E is based on equilibrium molalities calculated by consideration of the equilibrium speciation of Li2B4O7 to partially form H3BO3, B(OH) −4 and B3O3(OH) −4 . The stoichiometric equilibrium constant K m for the aqueous speciation reaction was estimated. Two representations of the osmotic coefficients of Li2B4O7 + LiCl + H2O were made with Pitzer’s ion-interaction model. Model (1) involved representing the φ S values with six parameters based on considering the ionic interactions between Li+, Cl−, and B4O 2−7 ; and model (2) involved representing the φ E values based on the calculated equilibrium speciation. Reasonable agreements were obtained between the experimental osmotic coefficient data and those calculated using the above models, with standard deviations of 0.075 and 0.0229, respectively, for these two models. The thermodynamic osmotic coefficients for the complex system containing polymeric boron anions and lithium cation was modelled and explained by use of Pitzer’s ion-interaction model, with minor modifications in combination with speciation reaction equilibria.

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Authors and Affiliations

  1. Department of Chemistry, Linyi Normal University, Linyi, 276005, People’s Republic of China

    Ji-min Yang, Qi-ying Xia, Bao-hui Li, Shu-yong Xu & Jie Yang

  2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, People’s Republic of China

    Yan Yao

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  1. Ji-min Yang
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Correspondence to Ji-min Yang.

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Yang, Jm., Yao, Y., Xia, Qy. et al. Isopiestic Determination of the Osmotic Coefficients and Pitzer Model Representation for the Li2B4O7+LiCl + H2O System at T=298.15 K. J Solution Chem 37, 377–389 (2008). https://doi.org/10.1007/s10953-007-9244-0

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