chem 211 11 notes - Ch. 11 Mixed solutions and buffers...

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Ch. 11 Mixed solutions and buffers Buffer action A buffer is a solution in which the pH resists change when strong acids or bases are added Acid buffer has a weak acid and its conjugate base Base buffer has weak base and conjugate acid They react w/ any added acid or base to control the pH Provide a source and a sink for protons Designing a buffer Need to know pH at which a buffer stabilizes the solution For acid buffer Weak acid with a pKa close to pH and add its conjugate base in the form of a salt For base buffer Weak base w/ pKa close to desired pH and add acid in form of salt [ ] log [ ] initial a initial base pH pK acid = + use similar concentrations buffer capacity buffers have a maximum amount of acid or base that can be added before it looses its ability to resist large changes in pH a buffer is exausted when most of weak base/acid has been conveted to its conjugate acid/base concentrated buffer has more capacity than a weak buffer
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This note was uploaded on 08/17/2009 for the course CHEM 211 taught by Professor Crane, b during the Fall '06 term at Cornell University (Engineering School).

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chem 211 11 notes - Ch. 11 Mixed solutions and buffers...

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