Class Notes Mar 03

# Class Notes Mar 03 - Announcements Wednesday March 3 2010...

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3/3/2010 1 Announcements: Wednesday, March 3, 2010 Homework WebAssign #8- Due Thursday , March 4 at 8:00 AM WebAssign #9- Due Wednesday, March 10 at 8:00 AM Recitation Week 8 – Redox of Halogens Lab- Spontaneity of Oxidation-Reduction Reactions Bring GLOVES!! Complete your prelab before recitation. Report due at the end of lab! Suggested Textbook Questions Continue Chapter 21 problems and reading. Which of the following is the correct Nernst equation for this cell at 25ºC? Cu(s) | Cu 2+ (aq, 0.1 M) || Ag + (aq, 0.2 M) | Ag(s) March 3, 2010 – CT#1 A. E cell = 0.46 V – ( 0.0592 / 2 )log{(0.2)/(0.1)} B. E cell = 0.46 V – ( 0.0592 / 2 )log{(0.1)/(0.2)} C. E cell = 0.46 V – ( 0.0592 / 2 )log{(0.2) 2 /(0.1)} E. E cell = 0.46 V – ( 0.0592 / 1 )log{(0.2)/(0.1)} D. E cell = 0.46 V – ( 0.0592 / 2 )log{(0.1)/(0.2) 2 } Cu(s) + 2 Ag + (aq) = Cu 2+ (aq) + 2Ag(s) n = 2 Q = [Cu 2+ ]/[Ag + ] 2 = (0.1)/(0.2) 2 Nernst Equation At 25 º C, what [Ag + ] is necessary to get a cell potential of +1.00 V from the following cell? In(s)|In 3+ (aq, 0.1 M)|| Ag + (aq, ? M)|Ag(s) Net Reaction: 3Ag + (aq) + In(s) In 3+ (aq) + 3Ag(s) Q = [In 3+ ] [Ag + ] 3 Q = (0.1) (x) 3 E cell = E cathode - E anode E cell = E Ag - E In E cell = (+0.80)-(-0.34) E cell = +1.14 V At 25

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Class Notes Mar 03 - Announcements Wednesday March 3 2010...

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