Solubility of sodium hexahydroxoantimonate in water and in mixed aqueous solvents

Abstract

The enthalpy of solution of sodium hexahydroxoantimonate in water has been determined, from measurements of its solubility as a function of temperature, as +33 kJ mol^–1. Hence the enthalpy of hydration of the (gaseous) hexahydroxoantimonate anion has been estimated as –124 kJ mol^–1(assuming an enthalpy of hydration of –1091 kJ mol^–1 for the proton). The variation of the solubility of sodium hexahydroxoantimonate with solvent composition in a range of binary mixed aqueous solvents has been determined.