# Report (Data Analysis and Discussion)

Consult with the lab instructor about content and format of the report. Suggested content includes graphs, plots, calculations and discussion. Make a suggested “do” list with things to consider and questions to answer [see reference 5 about CV calculations].

- Show plots of I
_{p}vs. APAP concentration at a scan rate of 100 mV/s, and from the plot calculate and report the concentration of the unknown APAP. Correct the I_{p}for background charging current by extrapolating the initial straight part at the foot of the wave. With the computer-controlled potentiostat (CS-1200), I_{p }and E_{p }values can be determined with the imbedded “math” software, including baseline corrections. - Plot I
_{p}vs. square root of the scan rate for the oxidation of APAP from results obtained at pH 2 and 7. - Are the plots linear? If not, why not?
- Does the E
_{p}value for the oxidation of APAP shift with pH? What is the theoretical value of the E_{p}shift? Show your reasoning. - At pH 7, why is the reverse cathodic peak height less than that for the oxidation of APAP?
- At pH 7, what is the formal potential for step 1?
- At pH 2, what are the differences in the CVs at slow and fast scan rates? Explain.
- Are your results consistent with the proposed mechanism in Figure 1?
- Did the results vary with the way in which you pretreated the electrode? What method of pretreatment produced the lowest E
_{pa}value and best reproducibility? - Comment on what worked and what did not work for you in this experiment. What changes would you propose to improve the experiment?