Thermodynamics of silver-silver bromate, silver-silver iodate, silver-silver sulphate, silver-silver chromate and silver-silver dichromate electrodes i

Abstract

The standard potentials of the silver-silver bromate, silver-silver iodate, silver-silver sulphate, silver-silver chromate and silver-silver dichromate electrodes in four different compositions of water + urea mixtures at four different temperatures from 5 to 35 °C have been determined from EMF studies of the cell: Ag(s), AgCl(s), KCl(c)//K xZ(c/x), Ag xZ(s), Ag(s) where x is 1 or 2, and Z is BrO 3, IO 3, SO 4, CrO 4 or Cr 2O 7. These values have been used to evaluate the transfer thermodynamic quantities accompanying the transfer of 1 g-ion of BrO 3 −, IO 3 −, SO 4 2−, CrO 4 2− or Cr 2O 7 2− from the standard state in water to the standard state in water + urea mixtures. From the standard electrode potential values, the thermodynamic solubility products of Ag xZ have also been computed in these solvents.