✍ Scribed by István J. Zsigrai; Katalin Mészáros Szécsényi
No coin nor oath required. For personal study only.
The excess chemical potentials of AgNO, have been measured using a suitable formation cell over a wide composition range of the ternary AgNO,-KNO,-NaNO, system. The coefficients of series expansions in the composition variables of t= %NOa (X,'NO, + XN.NO,) and XA,NO, for isothermal excess chemical potential of AgNO, were determined. The experimental data show a maximum at t = 0.500 for all the temperatures and mole fractions of silver nitrate. Such an anomalous phenomenon in a ternary AgNO,-KNO,-NaNO, 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 AgNO, in the mixture.
T'he conformal ionic solution (CIS) theory has been tested with respect to its capability to predict the excess chemical potential in a ternary AgNO,-KNO,-NaNO, molten system.
From the linear temperature dependence of emf values in pure AgNO, and in ternary molten salt mixtures, the partial excess enthalpies and partial excess entropies of silver nitrate in the AgNO,-KNO,-NaNO, melts were calculated.
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An electrode of the third kmd, respondmg to metal-ion concentration changes m alkahmetal nitrate melts, IS described, and special features and &fficultles attendmg Its practical application are discussed It has been employed to momtor the varymg uncomplexed cadmium ion concentration during titration