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The rotating disk electrode has been used to investigate the transition between the peak current and the limiting current regions in terms of the chief mode of mass transport which controls the electrode process. The oxidation of ferrocyanide in chloride solution on wax-impregnated graphite was the experimental system used. Experiments at slow rotation speeds and fairly fast polarization rates show current peaks rather than plateaus, indicating that the main mode of mass transport of the electroactive species to the electrode surface is determined not only by whether the electrode is rotated or not, but also by the relative magnitudes of the speed of rotation and of the rate of polarization.Theoretical explanation of this phenomenon is given. HE ORIGINAL PURPOSE of using

Values of the molal activity coefficient of hydrochloric acid in these four methanol-water solvents have been calculated by Equation 2and are given in Table V. The values of b were obtained from the slopes of the extrapolation lines whose intercepts were the standard potentials ,E°. The activity coefficients in 10 and 20% methanol are compared with those found by Earned and Thomas; the agreement is good except at 0.1m in 20% methanol.Figure 1 is a plot of log y^v s. m1/2 for 45 and 75% methanol, the straight lines representing the limiting Debye-Hilckel slopes. The activity coefficients are much lower in 70 than in 45% methanol. Nevertheless, the experimental curves approach the theoretical straight lines from above in both instances. There is no evidence, therefore, of ion-pair formation even in 70% methanol.

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