Standard potentials of the silver—silver tungstate, silver—silver phosphate, and silver—silver arsenate electrodes in water—dioxane and water—urea mixtures and related thermodynamic functions

Abstract

The standard potentials of the silver—silver tungstate, silver—silver phosphate and silver—silver arsenate electrodes in four different compositions of water—dioxane and water—urea mixtures at seven different temperatures from 5 to 35°C have been determined from EMF measurements of cells of the type Ag(s), AgCl(s), NaCl(c)//Na x Z(c/ x), Ag x Z(s), Ag(s), where x is 2 or 3, and Z is WO 4, PO 4 or AsO 4. These values have been used to evaluate the transfer thermodynamic quantities accompanying the transfer of 1 g ion of WO 2− 4. PO 3− 4 or AsO 3− 4 ion from the standard state in water to the standard state in water—dioxane or water—urea mixtures.