1. Answer the following questions Stripping methods are generally more sensitive than other voltametric procedures becau

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1 Answer The Following Questions Stripping Methods Are Generally More Sensitive Than Other Voltametric Procedures Becau 1 (218.79 KiB) Viewed 77 times

1. Answer the following questions Stripping methods are generally more sensitive than other voltametric procedures because the analyte ca be removed from a relatively large volume of solution and concentrated on a tiny electrode for a long period. After concentration, the potential is reversed and all of the analyte that has been stored on the electrode is rapidly oxidized or reduced, producing a large current. A. Both statements are true. C. Only the first statement is true. B. Both statements are false. D. Only the first statement is false. .When Cd2+ ions are reduced to Cd atoms at the electrode surface, the concentration of Cd2+ at the surface becomes very small. Cd2+ ions from the bulk solution then moves to the electrode surface as a result of concentration gradient. The mechanism of reactant transport to the electrode surface just described is A. convection B. migration C. diffusion D. capillary action What is the purpose of an auxiliary electrode in a three-electrode system for voltametric measurements? A. It allows potential developed in the cell to be measured without changing the potential of the reference electrode. B. It allows current to flow in the electrochemical cell without passing significant amount of current in the reference electrode. C. It decreases resistance for the electrochemical cell for easy measurement of potential. D. It provides a space where charge can be accumulated and measured. An aqueous solution of Fe(SCN)2+ is red because A. the complex adds red radiation to the solvent. B. the complex absorbs the green component from the incoming white radiation and transmits the red component. C. the solution absorbs the red component of the incoming white radiation. D. the green component, which is the complementary color of red, of the incoming white radiation is transmitted. A process in which a chemical species selectively attenuates certain frequencies of electromagnetic radiation. A. Attenuation B. Absorption C. Emission D. Fluorescence