Thermodynamic properties of Cs2[B4O5(OH)4] · 3H2O

The enthalpies of solution of Cs2[B4O5(OH)4] · 3H2O in HCl(aq), and of CsCl in (HCl + H3BO3)(aq) were determined. With the incorporation of the previously determined enthalpy of solution of H3BO3 in HCl(aq) and the standard molar enthalpies of formation of CsCl(s), H3BO3(s), HCl(aq), and H2O(l), the standard molar enthalpy of formation of Cs2[B4O5(OH)4] · 3H2O of −(4859.23 ± 0.64) kJ · mol−1 was obtained. Thermodynamic properties of this compound were also calculated by a group contribution method.