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Unformatted text preview: 10. A solution prepared with 4 x 10 –4 moles of acetic acid (CH 3 COOH) dissociates in water to produce 2 x 10 –3 moles of protons and 3.2 x 10 –6 moles of conjugate base. a. What is the dissociation constant (Ka) for acetic acid? b. What is the pKa of acetic acid? c. Draw the structure of the conjugate base. d. What is the pH of this solution (Henderson-Hasselbach)? Chapter 3 11. Draw the zwitterion of the amino acid valine. 12. At pH 9.5, what is the net charge for Ala, Gly, and Phe? At pH 1.5? At pH 12? 13. What is the pI value for Ala, Gly, and Phe? 14. Draw the peptide bond. 15. Identify the primary sequence for the polypeptide that yields these fragments upon treatment: His-met-thr-met-ala-trp; Leu-asn-asp-phe; Val-lys obtained from chymotrypsin Leu-asn-asp-phe-his-met; Ala-trp-val-lys; Thr-met obtained from CNBr...
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- Spring '08
- pH, hydroxyl functional group