L20 - Lecture 20 How Resilient: Buffers Two solutions at pH...

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Lecture 20 How Resilient: Buffers Key Idea: Buffers resist changes in pH upon addition of strong acids or bases. Two solutions at pH = 3.5 How are these two solution similar? How are they different? 1 HCl: pH = 3.5 H 3 O + Cl - 2 H 3 O + CH 3 COO - CH 3 COOH: pH = 3.5 Note: [HCl] = 3.2 x 10 -4 M [CH 3 COOH] = 5.6 x 10 -3 M Dry ice in a basic solution (NaOH) with a universal indicator. 2 2 2 2 2 2 3 2 3 2 3 2 3 2 3 3 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1. 2. 3. 4. CO aq H O l CO aq CO aq H O l H CO aq H CO aq NaOH aq H O HCO H CO aq H O H O HCO ! + ! + + + " + + + Dry ice in a solution of Na 3 PO 4 with a universal indicator 2 3 13 4 2 4 3 3.6 10 a HPO H O PO H O K ! ! + ! + + = " 2 3 2 3 3 3 4 3 4 2 ( ) H CO aq H O H O HCO PO H O HPO H O + ! ! + ! + + + " + Buffer is a solution containing both a weak acid and its conjugate base. Buffers resist large changes of pH upon addition of strong acids or bases. 2
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at University of California, Berkeley.

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L20 - Lecture 20 How Resilient: Buffers Two solutions at pH...

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