Thermodynamics of a silver, silver azide electrode in water and water + dioxan at different temperatures
The e.m.f. of the cell Ag, AgCl(s)| NaCl(m)⋮ NaN3(m)| AgN3(s), Ag in water and water +10, +20, +30 and +40 mass % dioxan has been measured at 5 °C intervals from 5 to 45 °C. The values of the standard potentials of the silver, silver azide electrode have been determined in water and the mixtures at these temperatures. The change in standard thermodynamic quantities (ΔG⊖, ΔH⊖ and ΔS⊖) for the electrode reaction have been evaluated. The thermodynamic parameters for the transfer of HN3 from water to the mixtures have also been evaluated. The results are discussed in terms of the preferential solvation of ions.