12-2-08[lecture22]mo

12-2-08[lecture22]mo - Chem 116 Lecture 22 Notes 12/12/08...

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Chem 116 Lecture 22 Notes 12/12/08 (MO) SOHe method of balancing redox equations *If you balance half reactions using this method, you will always have a balanced overall reaction Practice using SOHe method *Know difference between species and element 0 +5 +2 +4 1. Cu(s) + NO 3 - (aq) Æ Cu 2+ (aq) + NO 2 (g) in acid Elements whose oxidation numbers are changing Cu: 0 Æ +2 (oxidation) N: +5 Æ +4 (reduction) Species on reactant side Species on product side Cu (s) (oxidized) Cu 2+ (aq) NO 3 - (reduced) NO 2 (g) Oxidation half reaction Cu Æ Cu 2+ + 2e- *add 2e- to product side to make charge on reactant side = charge on product side Reduction half reaction NO 3 - +2H + + e- Æ NO 2 + H 2 O *Add oxygens needed by adding H 2 O *Add H + to side that needs hydrogens (do this if the redox reaction is in acid solution) if the redox reaction were happening in basic solution, you would add OH - to one side and H 2 O to the other side, to balance the hydrogens, because the side that gets H 2 O is adding one more H
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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12-2-08[lecture22]mo - Chem 116 Lecture 22 Notes 12/12/08...

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