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# CheatSheet9 - CH204 Spring 2009 Cheat Sheet for Experiment...

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CH204 Spring 2009 Cheat Sheet for Experiment 9. Acid-Base Equilibria 1 Part 3. The Ionization Constant of Acetic Acid Solution: 10 ml of 1.5 M CH 3 COOH Measured: pH To be determined: K a Calculations: 1. x = = - + pH 3 10 ] O H [ 2. Determine [CH 3 COO ] and [CH 3 COOH] from the following: CH 3 COOH + H 2 O CH 3 COO + H 3 O + 1.5 0 0 initial –x x x change (1.5 – x) x x equilibrium 3. ) 5 . 1 ( ] COOH CH [ ] COO CH ][ O H [ K 2 3 3 3 a x x - = = - + Solution: 30 ml of 1.5 M NaCH 3 COO + 10 ml of 1.5 M CH 3 COOH CH 3 COOH + H 2 O CH 3 COO + H 3 O + ( reversible ) NaCH 3 COO CH 3 COO + Na + ( to completion ) Measured: pH To be determined: K a Assume that the equilibrium molarities of CH 3 COOH and CH 3 COO are the same as their initial molarities. However, keep in mind that the initial molarities decrease after the two solutions are mixed together (they dilute each other) Calculations: 1. pH

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## This note was uploaded on 05/06/2009 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas.

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CheatSheet9 - CH204 Spring 2009 Cheat Sheet for Experiment...

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