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Determination of vanadyl sulfate ion-pair dissociation constant at 298.15 K by Fuoss method

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Abstract

Vanadium battery has fast and large capacity charge and discharge characteristics, and the concentration and stability of the battery electrolyte are the key to the electrolyte performance. In actual, with higher acidity and higher concentration of the vanadium battery electrolyte, the ion-pair is dominant. The ion-pair dissociation constant is one of the important thermodynamic data related to battery performance. The vanadyl sulfate conductivity in aqueous solution was determined using the conductance method at 298.15 K. Using the origin data fitting, the limiting molar conductance is obtained, and then by the improved Ostwald dilution law and the Davies equation, the activity coefficient is solved so as to obtain the ionic strength of the true solution. Using the Fuoss method, the dissociation constant of vanadyl sulfate ion-pair was calculated. At last, the vanadyl sulfate limiting molar conductance (Λ 0 ) is 174.8251748 S·dm2·mol−1, and the vanadyl sulfate ion-pair dissociation constant K d is 0.002636367, and then other thermodynamic properties can be studied.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 21273152).

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Authors and Affiliations

  1. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang, 110159, China

    Shu-Di Zhang & Wei-Min Chen

  2. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Shu-Di Zhang, Pei-Hua Ma & Yu-Chun Zhai

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  1. Shu-Di Zhang
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  2. Pei-Hua Ma
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  3. Yu-Chun Zhai
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  4. Wei-Min Chen
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Correspondence to Shu-Di Zhang.

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Zhang, SD., Ma, PH., Zhai, YC. et al. Determination of vanadyl sulfate ion-pair dissociation constant at 298.15 K by Fuoss method. Rare Met. 34, 873–876 (2015). https://doi.org/10.1007/s12598-014-0353-9

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  • DOI: https://doi.org/10.1007/s12598-014-0353-9

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