Abstract
operating under limiting conditions (current independent of cathode potential), so that the cathode reaction becomes diffusion controlled ( 7 , 2 ) . When one correlates and generalizes such mass-transfer information, accurate values of the density and viscosity of the solution as well as the diffusivity of the ferricyanide ion are required. Values recently determined in this laboratory are communicated here and refer to the following conditions: (a) Concentrations of potassium ferriand ferrocyanides were 10 and 20 mol m-3, respectively. (The higher ferrocyanide concentration gives some protection against its anodic oxidation and, together with a larger anode than cathode area, causes the cathodic processes to become rate determining). (b) To suppress mass transfer by ionic migration, 500-3000 mol m-3 of NaOH was added as indifferent electrolyte. (c) Temperature was varied in the range 288-308 K. This variation coupled with the wide range of NaOH concentrations permitted a range of Sc from 873 to 6279 to be obtained.
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