Thermodynamic Properties of the Alkali Metals in Aluminum Chloride‐Propylene Carbonate Solution

Abstract

EMF measurements were performed at 25° and 35°C on the general cell Mfalse(normalsfalse)/normalMCl false[solution in AlCl3 false(1normalmfalse)normalinPCfalse]/normalTlClfalse(normalsfalse)/normalTlfalse(normalHgfalse) , where M represents Li, Na, K, Rb, and Cs. The standard electrode potentials of the alkali metals in AlCl3 false(1normalmfalse)‐PC solution evaluated by extrapolation to infinite dilution follow the order: normalCs<normalRb<K<normalLi<normalNa which is different than the order in water. Activity coefficients of the alkali metal chlorides were calculated for a wide range of molalities. The partial molal Gibbs free energies, entropies, and enthalpies of the cell reactions have been evaluated and compared to those in other solvents.