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CHEM108: Analytical Chemistry

Unit 5: Electrochemistry   Analytical electrochemical methods measure the response of an electrolyte through current of potential.  Electrochemical methods are very accurate and have the advantage of not requiring calibration or a standard.  This unit begins with a review of electrochemistry and galvanic (voltaic) cells.  The next subunits describe potentiometric and coulometric methods of analyte analysis.   Potentiometric methods measure electrode potential to analyze the analyte’s activity.  Coulometric methods measure the amount of electricity produced or consumed during electrolysis of an analyte.  The final subunit discusses voltammetricmethods, whichmeasure the current as a function of the applied potential to an analyte.

Unit 5 Time Advisory
This unit will take approximately 12 hours to complete.

☐    Introduction: 8 hours

☐    Subunit 5.1: 1.0 hour

☐    Subunit 5.2: 1.5 hours

☐    Subunit 5.3: 0.5 hours

☐    Subunit 5.4: 1.0 hour

Unit5 Learning Outcomes
Upon successful completion of this unit, the student will be able to:

  • Comprehend the concepts of reduction-oxidation reactions and use them in electrochemical applications.
  • Explain how a voltaic (galvanic) cell works.
  • Understand how potentiometric and coulometric methods can be used to gain information about an analyte.
  • Reproduce and explain the peaks in a cyclic voltammogram.

5.1 Electrochemistry Overview   - Reading: David Harvey’s Analytical Chemistry 2.0: “Chapter 11: Electrochemical Methods” Link: David Harvey’s Analytical Chemistry 2.0: “Chapter 11: Electrochemical Methods” (HTML and PDF)

 Instructions: Click on the link to Chapter 11 to open the PDF. 
Read all of Chapter 11, pages 667-760 of the text.  This material
covers all of Unit 5.     

 Terms of Use: <span href="http://purl.org/dc/dcmitype/Text"
rel="dc:type">Analytical Chemistry 2.0</span> by [David
Harvey](http://web.me.com/dtharvey1213/Analytical_Chemistry_2.0/Welcome.html) is
licensed under a [Creative Commons
Attribution-NonCommercial-ShareAlike 3.0 Unported
License](http://creativecommons.org/licenses/by-nc-sa/3.0/). The
original version can be
found [here](http://www.asdlib.org/onlineArticles/ecourseware/Analytical%20Chemistry%202.0/Text_Files.html)[.](http://www.saylor.org/site/wp-content/uploads/2012/07/Chapter111.pdf)
  • Web Media: YouTube: Bannanaiscool’s “Senior Chemistry: Redox I-X” Link: YouTube: Bannanaiscool’s “Senior Chemistry: Redox”  (YouTube)

    Instructions: Watch the video in its entirety (total runtime: 46:42 minutes). These lectures review basic electrochemistry. 

    Terms of Use: The linked material above has been reposted by the kind permission of Rob Lederer, and can be viewed in its original form here.  Please note that this material is under copyright and cannot be reproduced in any capacity without explicit permission from the copyright holder. 

5.2 Potentiometric Analysis   - Assessment: David Harvey’s Analytical Chemistry 2.0: “Chapter 11: Electrochemical Methods:” Practice Exercises 11.1-11.6 Link: David Harvey’s Analytical Chemistry 2.0: “Chapter 11: Electrochemical Methods:” Practice Exercises 11.1-11.6 (PDF)

 Instructions: Work through practice problems 11.1 (p. 677), 11.2
(p. 678), 11.3 (p. 679), 11.4 (p. 685), 11.5 (p. 690), and 11.6 (p.
695).  Solutions to these problems begin on page 777.   
    
 Terms of Use: <span href="http://purl.org/dc/dcmitype/Text"
rel="dc:type">Analytical Chemistry 2.0</span> by [David
Harvey](http://web.me.com/dtharvey1213/Analytical_Chemistry_2.0/Welcome.html) is
licensed under a [Creative Commons
Attribution-NonCommercial-ShareAlike 3.0 Unported
License](http://creativecommons.org/licenses/by-nc-sa/3.0/). The
original version can be
found [here](http://www.asdlib.org/onlineArticles/ecourseware/Analytical%20Chemistry%202.0/Text_Files.html). 

5.3 Coulometric Analysis   - Assessment: David Harvey’s Analytical Chemistry 2.0: “Chapter 11: Electrochemical Methods:” Practice Exercise 11.7 Link: David Harvey’s “Analytical Chemistry 2.0: “Chapter 11: Electrochemical Methods” Practice Problem 11.7 (PDF)

 Instructions: Work on practice problem 11.7 (p. 725).  The solution
begins on page 779.     

 Terms of Use: <span href="http://purl.org/dc/dcmitype/Text"
rel="dc:type">Analytical Chemistry 2.0</span> by [David
Harvey](http://web.me.com/dtharvey1213/Analytical_Chemistry_2.0/Welcome.html) is
licensed under a [Creative Commons
Attribution-NonCommercial-ShareAlike 3.0 Unported
License](http://creativecommons.org/licenses/by-nc-sa/3.0/). The
original version can be
found [here](http://www.asdlib.org/onlineArticles/ecourseware/Analytical%20Chemistry%202.0/Text_Files.html). 

5.4 Voltammetric Analysis   - Web Media: YouTube: Pharmacy Brighton’s “Cyclic Voltammetry” Link: YouTube: Pharmacy Brighton’s “Cyclic Voltammetry” (YouTube)

 Instructions: Watch this brief video (runtime: 1:30 minutes).  This
video describes the information obtained from a cyclic
voltammogram.  

 Terms of Use: Please respect the copyright and terms of use
displayed on the webpage above.