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4-12_practice_exam_2_Spr08

4-12_practice_exam_2_Spr08 - 4:12 Spring 2007 exam question...

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4:12 Spring 2007 exam question used as the Spring 2008 Practice Exam 2 Questions with an asterisk (*) before the number means the content is from Ch. 20. CHEMISTRY 4:012 – PRINCIPLES OF CHEMISTRY II PRACTICE EXAM # 2 30 Questions Formulae / constants: + = ] acid [ ] base [ log pK pH 10 a Δ G° = - R T ln K Δ G = Δ H – T Δ S FYI: A few more equations will be provided on the Fall 2007 exam, and will be posted separately. _________________________________________________________________ 1. Which of the following acids is the strongest acid? A) HClO 4 B) HClO 3 C) HBrO 4 D) HIO 4 E) HClO 2 2. Aspirin (acetylsalicylic acid) is absorbed from the stomach in the free (non-ionized) acid form. If a patient takes an antacid that adjusts the pH of the stomach contents to 4.05 and then takes two 5-grain aspirin tablets (total of 0.65 g aspirin), how many grams of aspirin are available for immediate absorption from the stomach, assuming immediate dissociation? Also assume that aspirin does not change the pH of the stomach environment. The pK a of aspirin is 3.50, and its formula weight is 180.2 g/mol. A) 0.65 g B) 0.42 g C) 0.33 g D) 0.14 g E) 0.033 g 3. A 1.0 M aqueous solution of which acid will give the highest pH?
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4:12 Spring 2007 exam question used as the Spring 2008 Practice Exam 2 Questions with an asterisk (*) before the number means the content is from Ch. 20. 4. Of the following pairs of species, which is not a Bronsted conjugate base-acid pair? 5. Which of the following is false for a buffered solution? 6. The dissociation of water, 2H 2 O H 3 O + + OH is an endothermic reaction. As the temperature is lowered, which of the following statements is true? A) The pH increases. B) The pH decreases. C) The pOH decreases. D) The [OH ] decreases. E) More than one of the above statements are true.
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