PS1 - BIOL/CHEM 3361 Biochemistry I Spring 2011 Due: Thur.,...

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BIOL/CHEM 3361 Biochemistry I Due: Thur., Feb. 3 at the start of class Spring 2011 ( No late Problem Sets will be accepted.) (You may turn them in early, e.g., at lecture on Tues. 2/1, to void last minute emergencies.) PROBLEM SET 1 For full credit, all steps to the solutions of the following problems must be shown. You may work together on the problems, but you may not copy or plagiarize. Your answers must show your own math steps and be in your own words. For problems 1-4, assume an activity coefficient of 1 for all substances and no effect of ionic strength. Eliminate terms in quadratic solutions for [H + ] only if the weak acid is dissociated < 1%. Reported pKa values can vary depending on the conditions under which they were measured; therefore, in solving the following problems use the pKa values given with the problems. 1. a. What is the pH of 100 mM HCl? b. What concentration of HCl will have a pH of 3.5? c. What is the pH of 100 mM acetic acid? (For acetic acid, pKa = 4.76) d. What concentration of acetic acid will have a pH of 3.5? 2. a. What is the pH of 0.1 M H 3 PO 4 ? (For H 3 PO 4 , pKa 1 = 2.12, pKa 2 = 7.21, pKa 3 = 12.32) b. If equal parts of 0.1 M H 3 PO 4 and 0.1 M NaOH are mixed, what will be the pH of the mixture? c. How many grams of NaOH (M
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This note was uploaded on 01/26/2011 for the course BIOL 3361 taught by Professor Spiro during the Spring '08 term at University of Texas at Dallas, Richardson.

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PS1 - BIOL/CHEM 3361 Biochemistry I Spring 2011 Due: Thur.,...

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