SOLUBILITIES OF SOME ALKALI-METAL SALTS, TETRAPHENYLARSONIUM CHLORIDE, AND TETRAPHENYLPHOSPHONIUM BROMIDE IN PROPYLENE CARBONATE AT 25-DEGREES-C USING THE ION-SELECTIVE ELECTRODE TECHNIQUE

The solubilities of 15 alkali-metal salts, MX (M+ = Li, Na, K, Rb, and Cs; X- = Cl, Br, and ClO4), tetraphenylarsonium chloride, and tetraph enylphosphonium bromide are reported in propylene carbonate (PC) at 25 -degrees-C, and the free energies of solution for these electrolytes i n this solvent have been determined. Combination of these values with solubility results in water yields the free energies of transfer of th e electrolytes from water to propylene carbonate. Transfer activity co efficients for the electrolytes have also been computed from their sol ubility products in water and in the nonaqueous solvent. The results i ndicate that the perchlorates are more soluble in propylene carbonate compared to the corresponding chloride or bromide salts.