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AnswerKey1 - 114A-I Chemistry 114A(Practice Problem First...

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114A-I 1 Chemistry 114A (Practice Problem; First Midterm) R, the gas constant, equals 8.3145 J/K.mol G = G ° + RT ln Q G ° = -RT ln K eq G = H - T S Amino Acid α - carboxylic acid α -amino acid side chain Alanine 2.35 9.87 Arginine 2.01 9.04 12.48 Asparagine 2.02 8.8 Aspartic Acid 2.1 9.82 3.86 Cysteine 2.05 10.25 8 Glutamic Acid 2.1 9.47 4.07 Glutamine 2.17 9.13 Glycine 2.35 9.78 Histidine 1.77 9.18 6.1 Isoleucine 2.32 9.76 Leucine 2.33 9.74 Lysine 2.18 8.95 10.53 Methionine 2.28 9.21 Phenylalanine 2.58 9.24 Proline 2 10.6 Serine 2.21 9.15 Threonine 2.09 9.1 Tryptophan 2.38 9.39 Tyrosine 2.2 9.11 10.07 Valine 2.29 9.72
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114A-I 2 1. Name different types of bonds you are familiar with? Briefly describe each of them. Give at least one example for each one—rank them based on their energetics. A: Please look at Table 2-1 in your text book 2. What is the concentration of OH- in a solution in which H+ concentration is 0.00013M? what is the pH of the solution? A. Kw=[H+][OH-] [OH-]=Kw/[H+]=10 -14 M2/1.3x10- 4 M=7.7x10- 11 M 3. Calculate the pKa of lactic acid, given that when the concentration of free lactic acid is 0.10 M and the concentration of lactate is 0.087 M, the pH is 4.80. A. pH=pKa + log [lactate]/[lactic acid] pKa= pH – log[lactate]/[lactic acid] = 4.80- log 0.87/0.10 = 4.80 – log 8.7 = 4.80 – 0.94 = 3.86 4. Amino acid glycine is often used as a buffer. Glycine has a pKa of 9.6.
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