emf studies of a ternary molten AgNO<inf>3</inf>KNO<inf>3</inf>NaNO<inf>3</inf> system

Abstract

The excess chemical potentials of AgNO3 have been measured using a suitable formation cell over a wide composition range of the ternary AgNO3KNO3NaNO3 system. The coefficients of series expansions in the composition variables of {A figure is presented} and xAgNO3 for isothermal excess chemical potential of AgNO3 were determined. The experimental data show a minimum at t = 0.500 for all the temperatures and mole fractions of silver nitrate. Such an anomalous phenomenon in a ternary AgNO3KNO3NaNO3 molten system is explained on the basis of the behavior of the subsidiary binary systems, as well as by change in the quasi-lattice structure of the melt, as a consequence of increasing the mole fraction of AgNO3 in the mixture. The conformal ionic solution (CIS) theory has been tested with respect to its capability to predict the excess chemical potential in a ternary AgNO3KNO3NaNO3 molten system. From the linear temperature dependence of emf values in pure AgNO3 and in ternary molten salt mixtures, the partial excess enthalpies and partial excess entropies of silver nitrate in the AgNO3KNO3NaNO3 melts were calculated. © 1993.