a. In Figure 17-20, is the reactant Fe(CN)63- _Fe(CN)^3-₆ or Fe(CN)64-Fe(CN)^4-₆ at points b, c, and d? Write the order of decreasing concentration of reactant at the electrode surface at points b, c, and d. For example, your answer might be c>b>d.c > b > d.

b. Why is there maximum current at c even though reactant concentration at the electrode is not greatest at point c? Why does current decrease from c to d even though potential is more negative at d?

c. Is the reactant Fe(CN)63- _Fe(CN)^3-₆ or Fe(CN)64-Fe(CN)^4-₆ at points e, f, and g? Write the order of decreasing concentration of reactant at the electrode at points e, f, and g.

d. Why is the current magnitude greater at f than at e? Why is the current not 0 0 at g?

e. Does time of the experiment increase in the order e4-₆] go through a maximum at increasing distances from the electrode at e

Figure 17-20

Transcribed Image Text:

Current Reduction →→→→ -Oxidation 013 1.00 69 E12 Epe с b E₁2 d Concentration Points b, c, d d Fe(CN) Epa Fe(CN) 0.75 0.50 0.25 0.00 -0.25 -0.50 0.00 0.01 0.02 0.03 0.04 Distance from electrode (cm) Potential versus S.C.E. Harris/Lucy, Quantitative Chemical Analysis, 10e, Ⓒ 2020 W. H. Freeman and Company 0.05 Concentration 0.00 e Points e, f, g Fe(CN) Fe(CN) 0.01 0.02 0.03 0.04 Distance from electrode (cm) 0.05 Fe(CN) and Fe(CN)64 Fe(CN) were taken as 0.7x10-9 m2 0.7 x 10-⁹ m² /s points a to g required 40 s.40 3. Center and right: Concentrations of Fe(CN)63- Fe(CN) FIGURE 17-20 Left: Simulated reversible cyclic voltammogram of ferricyanide at a planar electrode. Diffusion coefficients of Fe(CN)63 0.05 V/s. and the scan rate was 0.05 V/s." **The experiment from Fe(CN) and Fe(CN)64- as a function of distance from the electrode surface.