Thermochemistry of dicesium calcium tetraborate octahydrate |
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| Authors: | Zhu Lixia Yue Tao |
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| Institution: | a School of Science, Xidian University, 2 Taibai South Road, Xi’an 710071, PR China
b Xi’an Branch, Institute of Salt Lakes, Academic, Sinica, Xi’an 710043, PR China |
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| Abstract: | The enthalpies of solution of Cs2CaB4O5(OH)4]2·8H2O(s) in approximately 1 mol dm−3 aqueous hydrochloric acid and of CsCl(s) in aqueous (hydrochloric acid + boric acid + calcium oxide) were determined. From these results and the enthalpies of solution of H3BO3(s) in approximately 1 mol dm−3 HCl(aq) and of CaO(s) in aqueous (hydrochloric acid + boric acid), the standard molar enthalpy of formation of −(10328 ± 6) kJ mol−1 for Cs2CaB4O5(OH)4]2·8H2O(s) was obtained from the standard molar enthalpy of formation of CaO(s), CsCl(s), H3BO3(s) and H2O(l). The standard molar entropy of formation of Cs2CaB4O5(OH)4]2·8H2O(s) was calculated from the thermodynamic relation with the standard molar Gibbs free energy of formation of Cs2CaB4O5(OH)4]2·8H2O(s) computed from a group contribution method. |
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| Keywords: | Cs2Ca[B4O5(OH)4]2· 8H2O Standard molar enthalpy of formation Solution calorimetry Molar enthalpy of solution Aqueous hydrochloric acid solution |
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