Views
3 years ago

# REDOX & Electrochemistry - LSU Chemistry

REDOX & Electrochemistry - LSU Chemistry

## REDOX

REDOX 22Example: What is the potential for the followingreaction?2Na + (aq) + 2Cl − (aq)Cl 2 (g) + 2Na(s)Reduction half cell: Na + (aq) + 1e- Na(s) −2.71 VOxidation half cell: 2Cl − (aq) Cl 2 (g) + 2e- −1.36 Vsum = −4.07 VThis half-cell was theone that was flippedaround (reversed)Non-spontaneousThe reverse reaction is very spontaneous with a cellpotential of +4.07 V.

Example: What is the potential for theelectrochemical cell composed of the following 2When phrased like this, we are looking for a spontaneoushalf cell rxns? reaction that gives a positive cell potential!Cr +3 (aq) + 3e- Cr(s) -0.74MnO 2 + 4H + + 2e - Mn 2+ (aq) + 2H 2 O +1.28The Cr +3 (aq) + 3e- → Cr(s) rxn has the morenegative potential, so it gets flipped around:Cr(s) Cr +3 (aq) + 3e- +0.74MnO 2 + 4H + + 2e - Mn 2+ (aq) + 2H 2 O +1.28REDOX 23Now we have to balance the # of electrons in each rxn so wecan add them together. 6 e- is the common factor, so we needto multiply the Cr rxn by 2 and the MnO 2 rxn by 3:2[Cr(s) Cr +3 (aq) + 3e- ] +0.743[MnO 2 + 4H + + 2e - Mn 2+ (aq) + 2H 2 O] +1.282Cr(s) + 3MnO 2 + 12H +2Cr +3 (aq) + 3Mn 2+ (aq) + 6H 2 O +2.02VNote that you do NOT multiply the cellpotentials by the numerical factors (2or 3) used to balance the # of electronsin each half-cell rxn!!DANGER!!Commonmistake!!

Redox and electrochemistry
Electrochemistry PowerPoint
Electrochemistry [PDF] - University of Leicester
Chapter 21: Electrochemistry - Weironline.net
Lecture29 balancing redox - Chem.hope.edu
fundamentals of electrochemistry - bib tiera ru static
2302244: Electronic Lesson Introduction to Electroanalytical Chemistry
REDOX & Electrochemistry
Redox and Electrochemistry
Redox Reactions and Electrochemistry
Chapter 17: Electrochemistry Redox Reactions Oxidation Numbers ...
Electrochemistry
ELECTROCHEMISTRY
Electrochemistry
Electrochemistry (Ch 17) - AP Chemistry
Electrochemistry
Redox reactions and Electrochemistry - TestBag
ELECTROCHEMISTRY - Wits Structural Chemistry
Role of Palladium in the Redox Electrochemistry of Ferrocene ...
AP Chemistry Electrochemistry Review - Quia
Electrochemistry
Fundamentals of Electrochemistry - W.H. Freeman
Redox and Electrochemistry Name: Thursday, May 08, 2008 1. A ...
Redox/Electrochemistry Regents Unit Review - DP Chemistry
Redox Chemistry
Electrochemistry - Chem1 Concept Builder
GENERAL CHEMISTRY TOPICAL: Electrochemistry Test 1
Equilibrium Electrochemistry
General Chemistry Chapter 21: Electrochemistry
Electrochemistry - TestBag