In the electrolysis of pure molten silver nitrate with a silver cathode and a platinum anode at temperatures from 220 to 380Β°C a reversible cell is formed. When the system is electrolysed for a short time at a steady current density and then the current is interrupted, it tends to reach after a few seconds a reversible emf which is independent of the current density employed in the previous electrolysis. This emfis constant provided that the composition of the system is not altered. Short-circuiting the cell repeatedly always leads to the same emf.
The emf is related to the residual electrochemical cell formed during the electrolysis. The cell can be represented by the following scheme: AgIAgNOs(I)INOa,NO,O,/Pt. The reversible reactions involved in the cell are and Ag + NOB + 40, P AgNO, NO + 40, + NO,. The theoretical decomposition voltage of silver nitrate is coincident with the ones found experimentally, taking account of the actual concentrations of species involved in the reactions. R&n&-4Jne cellule reversible se forme dans l'tlectrolyse de AgNO, pur fondu avec cathode Ag et anode Pt. a des tern&attires de 220 a 380Β°C. Une courte Clectrolvse a courant stationnaire ensuite interrompu, suscite: apr& quelques secondes, une f.e.m. independante de la densite du wurant d'&ctrolyse; elle se maintient constante, mkme apres brefs court-circuits rep&es. La cellule ainsi engendr& peut &re represent& par AgIAgNO,OINO,,NO,O,/Pt de reactions reversibles 1 Ag + NO, + 40, G AgNO, NO + 40, e NO,. 11 y a d'ailleurs accord avec la tension de decomposition theorique de AgNOs. 2&smme&asunR-Rei der Elektrolyse von reinem geschmolzenem Silbemitrat bilden eine Silberkathode und eine Platinanode eine reversible Belle. Nach Stromunterbruch nimmt die Spannung rasch immer denselben Wert an unabhangig von der vorherigen Stromdichte. richt dem bei der Elektrolyse entstandenen Element Die Spannung entsp-Die ftir verschiedene Temperaturen berechnete theoretische Zersetzungsspannung stimmt mit den experimentellen Werten i&rein.