Abstract: | The stability constants (for the formation) of LaBr2+ and LaBr2+ ions were obtained potentiometrically at various ionic strengths at 20°, 25°, 30°, and 35°. The molal free energy was given by ΔG°=-2,444.04+2.67T log T+1.39T. The thermodynamic quantities for the formation of LaBr2+ were evaluated as ΔHf° = ?207.9, ΔGf° = ?199.1 kcal mole?1 and S° = ?29.5 cal. deg?1 mole?1 at 25°. |