Thermodynamic Properties of Alkali Nitrate—Silver Nitrate Melts

E M F measurements were performed on a chemical cell containing a silver and a nitrate electrode. The systems N a N 0 3 + A g N 0 3 , L i N 0 3 + A g N 0 3 , and pure A g N 0 3 were investigated in a temperature range of 240 ° C to 310 ° C and in the total concentration range permitted by the phase diagram. We f ound a linear dependence of the E M F on temperature. Six constants, characteristic for the investigated molten salts depending neither on composit ion nor on temperature, were determined by the analytical construction of the activity coefficients. Together with the analytically constructed excess molar Gibbs function, the excess molar entropy was calculated from calorimetric data in the literature.