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Chapter4a-problems - (basic R pK1=2.20 pK2=9.40 pI=0.5(2.20...

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1 Chapter 4: Problems Book: 1, 4-10, 12, 13, 16, 17 Book (Ch. 4, prob. 4) Draw the dipeptide Asp-His (DH) at pH 7.0 N-term=9.40, Asp=3.90, His=6.04, C-term=2.20 N COO- CH 2 -OOC O H H H NH 3 + N H N • Acid: If pH<pKa, neutral (0) If pH=pKa, (50% ionized, -0.5) If pH>pKa, charged (-1) • Base: If pH<pKa, charged (+1) If pH=pKa, (50% ionized, +0.5) If pH>pKa, neutral (0)
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