Chapter 25: Q. 4 (page 686)
Why is the reference electrode placed near the working electrode in a three-electrode cell?
In order to decrease drop, the reference electrode placed near the working electrode in a three-electrode cell.
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List the advantages and disadvantages of the mercury film electrode compared with platinum or carbon electrodes.
What is the purpose of the electrodeposition step in stripping analysis?
Why is it necessary to buffer solutions in organic voltammetry?
() What are the advantages of performing voltammetry with microelectrodes?
() Is it possible for an electrode to be too small? Explain your answer.
The working curve for the determination of dopamine at a nanoneedle electrode by differential-pulse
voltammetry (Figure 25-38) was constructed from the following table of data.
Concentration
Dopamine, mM Peak Current, nA
0.093 0.66
0.194 1.31
0.400 2.64
0.596 4.51
0.991 5.97
(a) Use Excel to perform a least-squares analysis of the data to determine the slope, intercept, and regres-
sion statistics, including the standard deviation about regression.
(b) Use your results to find the concentration of dopamine in a sample solution that produced a peak cur-
rent of 2.92 nA. This value is the average of duplicate experiments.
(c) Calculate the standard deviation of the unknown concentration and its 95% confidence interval
assuming that each of the data in the table was obtained in a single experiment.
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