Chapter 25: Q 25.3 (page 686)
Why is a high supporting electrolyte concentration used in most electroanalytical procedures?
Chapter 25: Q 25.3 (page 686)
Why is a high supporting electrolyte concentration used in most electroanalytical procedures?
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Distinguish between (a) voltammetry and amperometry, (b) linear-scan voltammetry and pulse voltammetry, (c) differential-pulse voltammetry and square-wave voltammetry, (d) an RDE and a ringdisk electrode, (e) faradaic impedance and double-layer capacitance, (f) a limiting current and a diffusion current, (g) laminar flow and turbulent flow, (h) the standard electrode potential and the half-wave potential for a reversible reaction at a working electrode, (i) normal stripping methods and adsorptive stripping methods.
Why is the reference electrode placed near the working electrode in a three-electrode cell?
Suppose that a spherical electrode can be fabricated from a single nano onion,_ , shown here. Nano onions comprise concentric fullerenes of increasingly larger size as indicated in the formula. Assume that the nano onion has been synthesized with a carbon nanotube tail of sufficient size and strength that it can be electrically connected to a tungsten needle and that the needle and nanotube tail can be properly insulated so that only the surface of the nano onion is exposed.
(a) Given that the radius of the nano onion is , find the surface area in , neglecting the area of the nanotube attachment.
(b) If the diffusion coefficient of analyte is , calculate the concentration gradient and the current for at a concentration of at the following times after the application of a voltage at is reduced.
(c) Find the steady-state current.
(d) Find the time required for the electrode to achieve steady-state current following the application of the voltage step.
(e) Repeat these calculation for a spherical platinum electrode and for a spherical iridium electrode with a surface area of .
(f) Compare the results for the three electrodes, and discuss any differences that you find.
A solution containing was analyzed voltammetrically using the standard addition method. Twenty-five milliliters of the deaerated solution, which was in , produced a net limiting current of } at a rotating mercury film working electrode at a potential of (versus ). Following addition of of a standard solution, the resulting solution produced a current of }. Calculate the concentration of the sample.
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