Charge Asymmetrical Ternary Molten Salt Systems: Theory of Dilute Solutions

Abstract

The thermodynamic properties of dilute solutions of in the ternary system have been investigated by the measurement of the reversible emf of the formation cellThe partial molar properties of have been found to be in good agreement with values predicted by the complex‐ion model reported in previous publications from this laboratory (1–3). In the present paper it is shown that these rather involved expressions reduce to useful, simple equations of the formwhere represents either an integral or a partial molar property. The ternary solution is denoted by the subscripts 1,2,3, while the two binaries, each containing the reactive‐metal chloride, are denoted by 1,2 and 1,3; is a concentration variable. It is also shown that the following expression applies to the activity of the reactive‐metal chloride (component 1) in solutionFor dilute solutions obeying Henry's law, the activity coefficients are given bywhere is the Henrian activity coefficient in the binary i,k and is the mole fraction of present in the ternary solution, providing that in the ternary 1,2,3 is the same as that in the two binary solutions 1,2 and 1,3.