Report (Data analysis and discussion):
- Page ID
- 60891
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Consult with the laboratory instructor about the contents and format of your report for this experiment. Suggestions and questions to help write your report are –
- Write a short summary of what you did in this experiment, noting any deviations or substitutions in the procedure.
- Show i-t profile with the test circuit (R = 10,000 Ω and C = 2 μF) and any others you may have obtained.
- Calculate the current for times of 0.1, 1.0, 2.0, 5 and 10 mS and compare the calculated vs. experimental currents. How well do they agree? Any discrepancies? If so, why?
- Calculate the capacitance of the 3 mm diameter electrode from i-t profile of the electrode in 0.1 M KNO3
- Figure 3 shows i vs. t for the calculated Cottrell relationship. The parameters for the calculations are listed in the text of this experiment. Show example calculations using these parameters for times of 10 mS, 100 mS and 1 second. Do they agree with the data in Figure 3?
- Calculate the D value for ferrocene carboxylic acid from the experimental i-t profile. [Suggestion: Since it1/2 is a constant, pick 3 or 4 values of i at different times, t, and take an average of the it1/2 values to calculate D]. Is this D value less or larger than the value for ferricyanide? Offer an explanation for this difference (hint: size and ionic charge considerations).