Abstract
The enthalpies of solution of Rb 2Ca[B 4O 5(OH) 4] 2·8H 2O in approximately 1 mol dm −3 aqueous hydrochloric acid and of RbCl in aqueous (hydrochloric acid+boric acid +calcium oxide) were determined. From these result and the enthalpies of solution of H 3BO 3 in approximately 1 mol dm −3 HCl (aq), and of CaO in aqueous (hydrochloric acid+boric acid), the standard molar enthalpy of formation of −10,308.06±6.57 kJ mol −1 for Rb 2Ca[B 4O 5(OH) 4] 2·8H 2O was obtained from the standard molar enthalpy of formation of CaO (s), RbCl (s), H 3BO 3 (s) and H 2O (l). The standard molar entropy of formation of Rb 2Ca[B 4O 5(OH) 4] 2·8H 2O was calculated from the thermodynamic relation with the standard molar Gibbs free energy of formation of Rb 2Ca[B 4O 5(OH) 4] 2·8H 2O computed from a group contribution method.
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