chapter 11 slides

chapter 11 slides - Aqueous Equilibria Chapter 11 CHEM 6B...

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1 Aqueous Equilibria Chapter 11 CHEM 6B Dr. DiPasquale CHEMICAL PRINCIPLES: Buffers and Buffered Solutions c The weaker the acid, the stronger its conjugate base. c The weaker the base, the stronger its conjugate acid. ( ) 2 ( ) 3 ( ) ( ) HA H O H O A aq l aq aq + + + ( ) 2 ( ) ( ) ( ) :B H O HB OH aq l aq aq + + +
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2 Buffers and Buffered Solutions c For the general acid HA: c For the general base B: 3 a [H O ][A ] [HA] K + = b [HB ][OH ] [B] K + = Buffers and Buffered Solutions c Buffers are compounds, (usually salts) when added to an aqueous solution, resist changes in pH. c An acid buffer is an aqueous solution of a weak acid and it’s conjugate base in salt form. c A base buffer is an aqueous solution of a weak base and it’s conjugate acid in salt form. c Acetates and phosphates are common anions in buffered solutions.
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3 pH of a Buffered Solution c 11.8 The pH of 0.50 M HBrO ( aq ) is 4.50 (pKa = 8.70). Calculate the change in pH when 7.5 g of
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This note was uploaded on 01/25/2011 for the course CHEM 6BL taught by Professor Berniolles during the Spring '08 term at UCSD.

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chapter 11 slides - Aqueous Equilibria Chapter 11 CHEM 6B...

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