Activities of dilute NiO in Na2O•2SiO2 by electromotive force measurements

The thermodynamic properties of dilute NiO in Na2O•2SiO2 for XNiO < 0.0125 have been investigated in the temperature range 1073–1173 K by emf measurements using the electrochemical cell[Formula: see text]where NiO denotes a solution with Na2O•2SiO2. It was found that for XNiO < 0.003 the solutions obey Henry's law. The Henrian activity coefficients and the related dilute solution thermodynamic properties based on the solid NiO standard state are reported.