ACEE219_Week5_new

ACEE219_Week5_new - ACEE ACEE 219 Environmental Chemistry...

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ACEE 219 Environmental Chemistry Week 5 March 30, 2010 novation Hall 127 ACEE 219 Spring 2010 HDP 1 Innovation Hall 127
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C H Diagram pC pC-pH Diagram pH Diagram pC-pH diagram for 10 -3 moles of HCN to 1 liter of pure water. 1. Mass balance on CN C T,CN = [HCN] + [CN - ] = 10 -3 2. Equilibrium relationships K w = [H + ][OH - ] = 10 -14 3 . 9 - a 10 [HCN] ] ][CN [H K + = = 3. Charge balance, Proton condition [H + ] = [CN - ] + [OH - ] ACEE 219 Spring 2010 HDP 2
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C H Diagram pC pC-pH Diagram pH Diagram H 0 0 2 4 6 8 10 12 14 pH 2 4 n, pC Line 1 (pC T -pH) - gC CN = pC = 3 6 entratio n logC T,CN pC 3 8 10 log Conc 12 14 ACEE 219 Spring 2010 HDP 3
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C H Diagram pC pC-pH Diagram pH Diagram H 0 0 2 4 6 8 10 12 14 pH 2 4 n, pC Line 2 (pOH - pH) -logK w = -log[H + ] - log[OH - ] 6 entratio n 14 = pH + pOH pOH = 14 - pH 8 10 log Conc 12 14 ACEE 219 Spring 2010 HDP 4
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C H Diagram pC pC-pH Diagram pH Diagram H 0 0 2 4 6 8 10 12 14 pH 2 4 n, pC 6 entratio n 8 10 log Conc Line 3 (pH - pH) - log[H + ] = pH 12 14 ACEE 219 Spring 2010 HDP 5
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C H Diagram pC pC-pH Diagram pH Diagram H 0 0 2 4 6 8 10 12 14 pH 2 4 n, pC ine 4 (pCN H) 6 entratio n Line 4 (pCN - pH) when K a >> [H + ] (i.e., pH > pK a ) = C ] [CN N , α 8 10 log Conc 1 + = + C K ] [H K CN T, a a CN T, 12 14 3 10 3 = = = ] p[CN C ] [CN CN T, ACEE 219 Spring 2010 HDP 6
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C H Diagram pC pC-pH Diagram pH Diagram H 0 0 2 4 6 8 10 12 14 pH 2 4 n, pC 1 = C ] [CN CN T, α 6 entratio n + = + C K ] [H K CN T, a a , 8 10 log Conc pC pH p CN T, a + = = + K ] p[CN C ] [H K ] [CN CN T, a 12 14 pH - 12.3 =
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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_Week5_new - ACEE ACEE 219 Environmental Chemistry...

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