Lecture2 - Lecture 2 Background reading Berg et al Chapter...

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Lecture 2 9/26/11 Background reading: Berg, et al.: Chapter 2: Pages 25 -33. Garrett and Grisham: Chapter 4: Pages 76 – 85. Assignment: Segel: Pages 92-93: problems 25 (parts a-d), 40, 41, 44. (Note: the Tris buffer that is used in Problem 41 is an amine. The two components of this buffer can be considered as RNH 3 + and RNH 2 .) Outline: Buffers. Polyprotic acids. Amino acids – general properties. Common amino acids found in proteins: Amino acids with nonpolar aliphatic R groups. Amino acids with polar uncharged R groups. Amino acids with aromatic R groups.
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Buffers The ability of a solution to resist a change in pH is its buffer action. Titration curve pH NaOH HA H + + A - Most buffers consist of a mixture of a weak acid and its salt. Capacity of buffer – how well the buffer maintains pH nearly constant depends on: 1) Molar concentration of buffer components 2) Ratio of conjugate base to acid. A good buffer functions within ± 1 pH unit of the pK a. For example: If a solution has a pK a = 8, then it is a buffer between pH 7 and 9.
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Polyprotic acids Acids capable of ionizing to form more than one proton per molecule of acid.
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