Handout8_Chapter_17 - Chemistry 008 Dr Neal Abrams brought...

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Chemistry 008 Handout #8 Dr. Neal Abrams brought to you by the Spring 2007 Learning Strategies Center NOTE: This review sheet is for Chem 008 attendees and is to be used in conjunction with lecture notes, handouts, problem sets, the textbook, the laboratory manual, and notes from Chem 008. Chapter 17 Review Guide Lectures 3/13, 3/15, 3/26 and 3/28 I. Buffers a. Definition - Buffer solutions contain a weak acid and its conjugate base (or a weak base and its conjugate acid) and therefore resist a drastic pH change when acid or base is added. b. Appreciable amounts of both the acid and its conjugate base must be present. c. The most effective buffering occurs when the [acid] = [conjugate base]. d. For a good buffer, 0.1 < [A - ]/[HA] < 10. e. Selecting an Appropriate Buffer - In general, the most appropriate buffer system for a solution of a desired pH is one in which the pK a of the acid is very close to the desired pH of the solution.
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