Thermodynamics of solid-state connected ion-sensitive membrane electrodes: The silver-Silver chloride system: Part II. Standard potentials (ε0′+εj) between 5 and 90°C of the 2nd kind silver-Silver chloride reference electrode with 3.5 M and sat'd KCl measured by means of membrane electrodes

Standard potentials (ε_M^0′+ε_j)_T of solid-state connected silver-silver chloride membrane electrodes (“chloride ion-sensitive electrodes”) in saturated and in 3.5 M (25°C) aqueous KCl solution (Ag|AgCl|KCl(sat'd or 3.5 M)||…) were measured between 5 and 90°C. The cells with transference comprised a Pt,H₂ electrode half-cell with NBS (DIN) phosphate buffer solution D. Identical thermodynamic behaviour of the membrane electrodes and respective 2nd kind silver-silver chloride electrodes and the small differences ΔE⁰ of their standard potentials E_M⁰ and E⁰, both reported in Part I of this work 1], allowed the application of the membrane electrode data to determine also standard potentials (ε^0′+ε_j)_T of the respective silver-silver chloride reference electrode of the second kind with “fixed potential” (Ag|AgCl(sat'd), KCl(sat'd or 3.5 M)6…). The results are discussed and compared with literature data.