Thermodynamics of calcium chloride in highly concentrated aqueous solution and in hydrated crystals

摘要: Measured values of the pressure H2O over saturated solutions in equilibrium with dihydrate, tetrahydrate or hexahydrate CaCl2 are converted to osmotic coefficients and compared literature for smaller molality. It is found that coefficient constant, within uncertainty, from about 7 mol-kg−1 soturation at all temperatures 25 100°C. From this simple approximation, activity calculated high molalities saturation. By combination these results other established data, entropies Gibbs energies formation crystalline hydrates CaCl2.