2. (a) Draw schematic diagrams of the current obtained at a platinum electrode when the potential is scanned from 600 to -200 and back to 600 mV (i) in a solution containing 0.1 M KCI (ii) in a solution containing the reversible redox couple, Co(phen)32 at a concentration of 1 mM and KC1 (0.1 M) 2+/3+ Co(phen)33++ e¯ Co(phen) 32+ Eº = 0.1 V (iii) (iv) Describe and explain the features of the current and potential obtained in both cases. Estimate the double layer capacitance of the electrode solution interface given that the current in a solution containing 0.1 M KCl was constant with a value of 0.5 µA, over the potential range 100 to 200 mV. The scan rate was 20 mV s¨¹.
2. (a) Draw schematic diagrams of the current obtained at a platinum electrode when the potential is scanned from 600 to -200 and back to 600 mV (i) in a solution containing 0.1 M KCI (ii) in a solution containing the reversible redox couple, Co(phen)32 at a concentration of 1 mM and KC1 (0.1 M) 2+/3+ Co(phen)33++ e¯ Co(phen) 32+ Eº = 0.1 V (iii) (iv) Describe and explain the features of the current and potential obtained in both cases. Estimate the double layer capacitance of the electrode solution interface given that the current in a solution containing 0.1 M KCl was constant with a value of 0.5 µA, over the potential range 100 to 200 mV. The scan rate was 20 mV s¨¹.
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter24: Coulometry
Section: Chapter Questions
Problem 24.5QAP: What cathode potential (versus SCE) would be required to lower the total Hg(II) concentration of the...
Question
![2.
(a) Draw schematic diagrams of the current obtained at a platinum electrode
when the potential is scanned from 600 to -200 and back to 600 mV
(i)
in a solution containing 0.1 M KCI
(ii)
in a solution containing the reversible redox couple, Co(phen)32
at a concentration of 1 mM and KC1 (0.1 M)
2+/3+
Co(phen)33++ e¯
Co(phen) 32+ Eº = 0.1 V
(iii)
(iv)
Describe and explain the features of the current and potential
obtained in both cases.
Estimate the double layer capacitance of the electrode solution
interface given that the current in a solution containing 0.1 M KCl
was constant with a value of 0.5 µA, over the potential range 100 to
200 mV. The scan rate was 20 mV s¨¹.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F482ea6df-1905-4786-94f6-4f83f0fe959f%2Fae46a59d-49c5-4bd5-bdfb-462c791d1d64%2Fhspugz_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2.
(a) Draw schematic diagrams of the current obtained at a platinum electrode
when the potential is scanned from 600 to -200 and back to 600 mV
(i)
in a solution containing 0.1 M KCI
(ii)
in a solution containing the reversible redox couple, Co(phen)32
at a concentration of 1 mM and KC1 (0.1 M)
2+/3+
Co(phen)33++ e¯
Co(phen) 32+ Eº = 0.1 V
(iii)
(iv)
Describe and explain the features of the current and potential
obtained in both cases.
Estimate the double layer capacitance of the electrode solution
interface given that the current in a solution containing 0.1 M KCl
was constant with a value of 0.5 µA, over the potential range 100 to
200 mV. The scan rate was 20 mV s¨¹.
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