47. The figure shows a steady-state microelectrode voltammogram of a neurotransmitter obtained in a solution of 0.1 M KCl at 10 mV/s. Which best describes this voltammogram? Current, i (A) 20 5 1.0 0.5 G.D 03 01 00 01 02 03 04 05 Potential, E (V) vs. Ag/AgCl (A) A scan-rate dependent oxidation wave with a cathodic limiting current of 2.0 nA and a standard oxidation potential of 0.20 V vs Ag/AgCl. (B) A scan-rate independent reduction wave with a

47. The figure shows a steady-state microelectrode voltammogram of a neurotransmitter obtained in a solution of 0.1 M KCl at 10 mV/s. Which best describes this voltammogram? Current, i (A) 20 5 1.0 0.5 G.D 03 01 00 01 02 03 04 05 Potential, E (V) vs. Ag/AgCl (A) A scan-rate dependent oxidation wave with a cathodic limiting current of 2.0 nA and a standard oxidation potential of 0.20 V vs Ag/AgCl. (B) A scan-rate independent reduction wave with a

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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10 Mg(s) + Cd(aq) -> Mg (aq) + Cd(s) E = +1.98 V The magnesium electrode was dipped into a 1.00 M salution of M9SO4 and the cadmium ele:trede was dipped into a solution of unknown Cd* concentration. The pctentlal of the cell was measured to be +1.54 V. What was the unknown Cd? concentration? (Answer : 1.4 x 1015 M)
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4 A Zn wire and Ag/AgCl reference electrode saturated with KCI (E = 0.197 V) are placed into a solution of ZnSO₂. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative terminal of the potentiometer. Calculate the [Zn²+] in the solution if the cell potential, Ecell, is -1.088 V. The standard reduction potential of the Zn² Zn half-reaction is -0.762 V. [Zn²+ = M
5) a) Typical Mg²+ concentrations in blood plasma are 2.2mM. If the transmembrane po- tential across the cell membrane is -90mV (negative inside), calculate the equilibrium con- centration of Mg²+ inside the red blood cell at 37°C. b) Consider the difference in electrochemical potential inside vs outside the cell, Aµreleefchem Helece/chem (inside) – Helec/chem(outside). As discussed in class, this difference is written as a chemical and electrical contribution, Afdee/chem = Aflchem + Atelec: For the red blood cell at equilibrium, state whether Atelee/chem; Atchem, and Aftelec are greater than, less than, or equal to zero, and explain your answer.
An ideal Pb?+ ion-selective electrode is moved from a 5.80 x 10- M Pb(NO,), solution to a 3.45 x 10- M Pb(NO, ), solution at 25 °C. By how many millivolts will the potential of the ion-selective electrode change when it is moved from the first solution to the second solution? mV AE =