407 - Practice Problem 4-7 Answer Draw a structural formula...

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Practice Problem 4-7 Answer Draw a structural formula for each salt. (a) Lithium acetate (b) Ammonium propanoate (c) Sodium benzoate (d) Potassium phenylacetate (e) Calcium butanoate (f) Zinc 10-undecenoate Practice Problem 4-8 Answer Complete the following acid-base reactions. Note : The conjugate acid of the HCO 3 anion is H 2 CO 3 , which decomposes to yield CO 2 + H 2 O Practice Problem 4-9 Answer The normal pH range for blood plasma is 7.35 7.45. Under these conditions, would you expect the carboxyl group of lactic acid (pK a 3.08 to exist primarily as a carboxyl group or as a carboxylate anion? Explain. When the pH of a solution is substantially higher than the pK a of an acid, that acid will exist primarily in its deprotonated form (i.e. its conjugate base). Since the pH of blood plasma is more than 4 units higher than the pK a of lactic acid, lactic acid exists primarily as its carboxylate anion when it is present in blood. C H 3 O O Li O O NH 4 O O Na O O K O O O O Ca 2+ O O O O Zn 2+ Na CH 2 CO 2 + O H 2 Na + O H 2 CH 3 CH=CHCH 2 CO 2 + CO 2 Na + O H 2 + CO 2 CO 2 OCH 3 O O OH H 3 N OH
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Practice Problem 4-10 Answer In each set, assign the acid its appropriate pK a . Practice Problem 4-11 Answer How can you explain the observation that hydroxyacetic acid (pK a = 3.83) is stronger than acetic acid (pK a = 4.76), yet p -hydroxybenzoic acid (pK a = 4.48) is weaker than benzoic acid (pK a = 4.18). The structures of hydroxyacetic acid and p -hydroxybenzoic acid are shown below. You should be able to draw the structures of acetic acid and benzoic acid on your own (without looking them up). The hydroxyl substituent in hydroxylacetic acid serves as an electron withdrawing group. The C-O bond has a dipole
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This note was uploaded on 10/25/2010 for the course CH 310n taught by Professor Iverson during the Summer '08 term at University of Texas at Austin.

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407 - Practice Problem 4-7 Answer Draw a structural formula...

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