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Solubility and thermodynamic studies of sparingly soluble tellurite salts

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Abstract

In the past few years, tellurium has attracted much attention as it is widely used in a large number of important industrial applications. Despite its importance, there is a lack of data on its salts in the literature. In this study, different sparingly soluble tellurite salts (e.g., Ag2TeO3, PbTeO3, CaTeO3, SrTeO3 and BaTeO3) were prepared and characterized using various techniques including powder X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray spectrometry, Fourier transform infrared spectroscopy and thermogravimetric analysis as well as differential scanning calorimetry. Moreover, the solubility and solubility product of these salts are studied by potentiometric method using carbon paste sensors. By applying standard and double standard addition methods, the tellurite ion content in the supernatant liquid (TeO 2−3 ) was determined at 25 °C. The solubility products were confirmed by atomic absorption spectroscopy and complexometric titrations, which indicate the high sensitivity and accuracy of the proposed potentiometric method. In addition, thermodynamic parameters such as Gibbs free energy ∆G°, enthalpy ∆H° and entropy ∆S° of the dissociation process or solution were calculated using the Debye–Hückel equation via the determination of solubility of metal tellurite salts at different temperatures.

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Acknowledgements

The authors would like to thank Amira M. Ahmed for her help in the solid characterization of the materials. This research was made possible through funding from Cairo University.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt

    Yousry M. Issa, Hussein M. Abdel-Fattah & Nahla B. Mohamed

  2. Department of Chemistry and Biochemistry, University of California, Los Angeles (UCLA), Los Angeles, CA, 90095, USA

    Nahla B. Mohamed

Authors
  1. Yousry M. Issa
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  2. Hussein M. Abdel-Fattah
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  3. Nahla B. Mohamed
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Contributions

Y.M.I. and N.M. perceived the project. N.M designed and carried out all experiments and wrote the manuscript. Y.M.I contributed to the analysis of the results and revised the manuscript. All authors discussed and commented on the results.

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Correspondence to Nahla B. Mohamed.

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Issa, Y.M., Abdel-Fattah, H.M. & Mohamed, N.B. Solubility and thermodynamic studies of sparingly soluble tellurite salts. J Therm Anal Calorim 145, 3207–3217 (2021). https://doi.org/10.1007/s10973-020-09932-0

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