ACEE219_Week14_new

ACEE219_Week14_new - ACEE 219 ACEE 219 Environmental...

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Unformatted text preview: ACEE 219 ACEE 219 Environmental Chemistry Environmental Chemistry Week 14 June 1, 2010 ACEE 219 Spring 2010 HDP 1 lectron Activity lectron Activity Electron Activity Electron Activity H = g[H + pH = -log[H ] p ε = -log[e- ] • ypothetical electron activity since a free electron doesn’t really exist in Hypothetical electron activity since a free electron doesn t really exist in solution. • We can measure E but not p ε p E = 2.3(RT/F)(p ε ) = 0.059 (p ε) volts/mole • p ε is a measure of the ability to accept or transfer electrons. • In a reducing environment, e- activity is high and p ε is low. • In a oxidizing environment, e- activity is low and p ε is high. ACEE 219 Spring 2010 HDP 2 lectron Activity lectron Activity Electron Activity Electron Activity he advantage of the electron activity concept is that it provides a formal • The advantage of the electron activity concept is that it provides a formal analogy to the H + and also allows one to deal with the reaction in a chemical intuitive format, i.e., Fe 3+ + e- → Fe 2+ K 2 1/2H 2 (g) → H + + e- K 3 Fe 3+ + 1/2H (g) → Fe 2+ + H + K 2 (g) 1 We normally write this with respect to a reference reaction • By thermodynamic convention however, K 3 =1 as the standard EMF of standard half reaction is = 0 and the activities of H 2 (g) and [H + ] =1 ACEE 219 Spring 2010 HDP 3 lectron Activity...
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This note was uploaded on 12/06/2011 for the course CHEM 219 taught by Professor Hee-deung during the Spring '10 term at Korea University.

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ACEE219_Week14_new - ACEE 219 ACEE 219 Environmental...

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