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Chapter 17: Q31P (page 430)
Suppose that the diffusion current in a polarogram for reduction of at a mercury electrode isIf the solution containsof 25mLofwhat percentage ofis reduced in the 3.4 min required to scan from?
The percentage of cadmium ion which can be reduced in polarogram is 0.12%.
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(a) How does the amperometric glucose monitor in Figure 7-12 work? b) Why is a mediator advantageous in the glucose monitor? c) How does the coulometric glucose monitor in Figure 17-14 work? (d) Why does the signal in the amperometric measurement depend on the temperature of the blood sample, whereas the signal in coulometry is independent of temperature? Do you expect the signal to increase or decrease with increasing temperature in amperometry?
(e) Glucoseis present in normal human blood at a concentration near 1g/L How many microcoulombs are required for complete oxidation of glucose in 0.300 of blood in a home glucose monitor if the concentration is 1.00g/L ?
Ions that react with can be determined electrogravimetrically by deposition on a silver working anode:
(a) What will be the final mass of a silver anode used to electrolyze 75.00 mL of 0.02380 M KSCN if the initial mass of the anode is 12.4638 g?
(b) At what electrolysis voltage (versus S.C.E.) will AgBr(s) be deposited from 0.10M Br? (Consider negligible current flow, so that there is no ohmic potential, concentration polarization, or overpotential.)
(c) Is it theoretically possible to separate 99.99% of0.10M Klfrom0.10MKBr by controlled-potential electrolysis?
What is a Clark electrode, and how does it work?
The cyclic voltammogram of the antibiotic chloramphenicol (abbreviated) is shown here. The first cathodic scan goes from 0 to -1.0 V. The first cathodic wave, , is from the reaction . Peak B in the reverse anodic scan could be assigned to . In the second cathodic scan from +0.9 to -0.4 V, the new peak C appears. Write a reaction for peak C and explain why peak C was not seen in the initial scan.
Cyclic voltammogram of 3.7 脳10-4 chloramphenicol in 0.1 M acetate buffer, pH 4.62. The voltage of the carbon paste working electrode was scanned at a rate of 350 mV/s. [Data from P. T. Kissinger and W. R. Heineman, 鈥淐yclic Voltammetry,鈥� J. Chem. Ed. 1983, 60, 702.]
Consider the cyclic voltammogram of the compoundrole="math" localid="1663646447735" . Suggest a chemical reaction to account for each wave. Are the reactions reversible? How many electrons are involved in each step? Sketch the sampled current and square wave polarograms expected for this compound.
Cyclic voltammogramofrole="math" localid="1663646461802" . [Data from W. E. Geiger, Jr., W. L. Bowden, and N. El Murr, "An Electrochemical Study of the Protonation Site of the Cobaltocene Anion and of Cyclopentadienylcobalt(I) Dicarbollides," Inorg. Chem. 1979,18,2358.]
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