Abstract
Electromotive force measurements on cells without liquid junction have been used to determine p K a of iodic acid and the standard electrode potentials ( E°) of the silver-silver iodate electrode in formamide at 9 temperatures from 5–45°C. The p K a was evaluated by using the Debye-Huckel theory with an ion-size parameter of 5.5 A°. The change in the standard electrode potentials is given as a function of temperature, t°C by the equation E° t = 0.2786 - 8.125 x 10 −4( t - 25) - 6.385 x 10 −6( t - 25) 2 The standard thermodynamic quantities (Δ G°, Δ H°, and Δ S°) for the cell reactions have been evaluated for different temperatures.
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