Lecture_Notes_101209b

Lecture_Notes_101209b - Lecture Note 10/12/2009

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Chem 105b Exam 2 Review 10/12/09
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Lewis Acid-Base Model z Draw the Lewis structures, label the Lewis acid and base and draw the electron donation using arrows for the reaction of water with sulfur dioxide to form sulfurous acid.
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Chapter 15 #48 z 48. Which of the following mixtures would result in a buffered solution when 1.0 L of each of the two solutions are mixed? z a. 0.2 M HNO 3 and 0.4 M NaNO 3 z b. 0.2 M HNO 3 and 0.4 M HF z c. 0.2 M HNO 3 and 0.4 M NaF z d. 0.2 M HNO 3 and 0.4 M NaOH
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Chapter 15 #122 z Tris(hydroxymethyl)aminomethane, commonly called TRIS of Trizma, is often used as a buffer in biochemical studies. Its buffering range is pH 7 to 9, and Kb is 1.19 x 10 -6 for the aqueous reaction: { (HOCH 2 ) 3 CNH 2 + H 2 O (HOCH 2 ) 3 CNH 3 + + OH - z a. What is the optimal pH for TRIS buffers?
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Chapter 15 #122 continued z b. Calculate the ratio [TRIS]/[TRISH+] at pH = 7.00 and at pH = 9.00.
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Chapter 15 #122 continued z c. A buffer was prepared by diluting 50.0 g of TRIS base and 65.0 g of TRIS
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This note was uploaded on 10/14/2009 for the course CHEM 105BLG at USC.

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Lecture_Notes_101209b - Lecture Note 10/12/2009

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