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BIS102 Hilt W06 MT1 -no answers

BIS102 Hilt W06 MT1 -no answers - 1 of 2 BIS 102 Winter...

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1 of 2 BIS 102 Name ________________________________________ Winter, 2006 Last First K. Hilt First Midterm Score (100): ___________ Equations: pH = pK a + log {[b]/[a]} (K a ) (K b ) = 1 x 10 -14 F = (q 1 q 2 ) / ε r 2 K b = x 2 / (y-x) G = H - T S K a = x 2 /(y - x) pH = (pK a 1 + pK a 2 )/2 PK a ’s are D (3.9), E (4.2), H (6.0), C (8.3), Y (10.1), K (10.5), R (12.5); α -COOH (2.1), α -NH 3 + (9.6);oligopeptide N-terminus (7.4), oligopeptide C-terminus (3.6) 1. (10 pts.) What are the concentrations of NH 3 and NH 4 Cl in a 0.20 M “ammonia” buffer, pH 9.50 (K b = 1.80 x 10 -5 )? Show all calculations. 2. (10 pts.) Calculate the pH of a 0.100 M solution of an amine that has a pK a of 9.70. Show all calculations. 3. (20 pts.) Fill in the blanks with the one-letter code of each amino acid that answers the question. A question may have more than one correct answer. Do not guess. Points will be subtracted for wrong answers. a) Side chain has an asymmetric carbon in it _______________________________________ b) Hydrophobic side chain consisting of 3 reduced carbons ____________________________
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