ACEE219_Week7_new

ACEE219_Week7_new - ACEE ACEE 219 Environmental Chemistry...

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ACEE 219 Environmental Chemistry Week 7 April 13, 2010 novation Hall 127 ACEE 219 Spring 2010 HDP 1 Innovation Hall 127
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eview of Exam 1 Review of Exam 1 ACEE 219 Spring 2010 HDP 2
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iprotic cid Diprotic Diprotic Acid Acid H 0 02468 1 0 1 2 1 4 pH pK a1 = 4.0 pK a2 = 8.0 2 4 n, pC [H 2 A] pC T,A = 2 [A 2- ] 6 entratio n [HA - ] 8 10 og Conc e 12 lo [H + ] [OH - ] ACEE 219 Spring 2010 HDP 3 14
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lpha Fraction (H ) Alpha Fraction (H 2 A) 2 2 2 0 ] [H A] [H α = = + + + 1 a,2 a,1 a,1 A T, ]K [H HA K K ]K [H ] [H C + + + a,2 a,1 a,1 2 a,1 A T, 1 K K ]K [H ] [H C ] [ α + + = = + + a,2 a,1 a,1 2 a,2 a,1 A T, 2 2 K K ]K [H ] [H K K C ] [A α + + = = + + ACEE 219 Spring 2010 HDP 4
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arbonic Acid H Carbonic Acid 10 -5 MH CO * 0 0 2 4 6 8 10 12 14 pH 2 3 2 , pC O 4 6 ntration [H 2 CO 3 *] pC T,CO3 = 5 8 10 og Conce [HCO 3 - ] 12 lo [H + ] [OH - ] [CO 3 2- ] 14 ACEE 219 Spring 2010 HDP 5 pK a1 = 6.3 pK a2 = 10.3
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arbonic Acid H Carbonic Acid 0 0 2 4 6 8 10 12 14 pH 5.7 7.6 9.0 2 , pC O 4 6 ntration [H 2 CO 3 ] pC T,CO3 = 5 8 10 og Conce [HCO 3 - ] 12 lo [H + ] [OH - ] [CO 3 2- ] 14 ACEE 219 Spring 2010 HDP 6
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ixtures of Acids and Bases Mixtures of Acids and Bases Estimation of pH for mixtures of acids and bases : Many important analytical methods, natural processes, and treatment schemes involve reactions between acids and bases Strong acid-strong base Mixtures (e.g.) HCl + NaOH, H 2 SO 4 + NaOH Weak acid-strong base and Strong acid-weak base Mixtures (e.g.) HAc + NaOH, HCl + NH 3 ACEE 219 Spring 2010 HDP 7
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xample 4 4 Example 4 Example 4-24 24 Strong acid-strong base mixture 5 mL 0.1M NaOH addition to 1 liter of 10 -3 M HCl solution Equilibrium K w = [H + ][OH - ] = 10 -14 Mass balances added volume liter 1 r moles/lite x10 liter 1 volume total moles of number ] [Cl C -3 Cl T, + = = = added volume liter 1 added volume x r moles/lite 0.1 volume total moles of number ] [Na C Na T, + = = = + Charge balances
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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_Week7_new - ACEE ACEE 219 Environmental Chemistry...

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