Class Notes Mar 05

Class Notes Mar 05 - 3/5/2010 Announcements: Friday, March...

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3/5/2010 1 Announcements: Friday, March 5, 2010 Homework WebAssign #9- Due Wednesday, March 10 at 8:00 AM Recitation Next Week Week 9 – Electrochemistry Lab Next Week- Voltaic Electrochemical Cells Complete your prelab before recitation. BRING GLOVES! Suggested Textbook Questions Finish Chapter 21 problems and reading. Begin Chapter 22 problems and reading. How long will it take to deposit 0.1 moles of Ag(s) from a 0.100 M AgNO 3 (aq) solution at a current of 96.5 A? March 5, 2010 - CT#1 A. 0.1 seconds B. 1 second C. 10 seconds E. 1000 seconds D. 100 seconds 0.1 mol Ag x (1 mol e - /1 mol Ag) x (96500 C/mol e - ) x (1 s/96.5 C) = 100 s Orange Juice Clock What redox reaction is running the orange juice clock? Think about what is present in the system: Cu(s), Mg(s), H + (aq) Cu(s) and Mg(s) can only be oxidized. anode H + (aq) can only be reduced. cathode Here are the possible half reactions from Appendix D: Cu 2+ (aq) + 2e - Cu(s) E ° = +0.34 V Mg 2+ (aq) + 2e - Mg(s) E ° = -2.37 V 2H + (aq) + 2e - → H 2 (g) E° = 0.00V It requires 1.50 V to run.
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This note was uploaded on 03/23/2010 for the course CHEM 1131 taught by Professor Redin,kend during the Spring '08 term at Colorado.

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Class Notes Mar 05 - 3/5/2010 Announcements: Friday, March...

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