A reproducible emf of the cell , , , Pt is found to be 0.262 v at 25°C. From this value and the known potential of the Ag, electrode, the standard oxidation potential of the , electrode is −0.604 v. The temperature coefficient of the cell is . The free energy, enthalpy, and entropy changes for the cell reaction are −6049 cal, −4537 cal, and 5.07 cal/deg, respectively. From these values and the existing thermodynamic data on Ag and , values of 3463 cal, −2769 cal, and 13.81 cal/deg are calculated, respectively, for the free energy and enthalpy of formation and for the entropy of at 25 °C.