Ex-4-3530-S10 - CHEM 3530 Exam 4(75 PART I MULTIPLE...

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CHEM 3530 - Exam 4 – April 23, 2010 (75) PART I. MULTIPLE CHOICE (Circle the ONE correct answer) 1. What is the approximate pH of a solution prepared by mixing 100 mL of 0.5 M NaOH with 200 mL of 0.3 M HCl? (A) 0.4 (B) 1.5 (C) 2.0 (D) 12.5 2. For the base, aniline (C 6 H 5 NH 2 ), pK b - 9.37. What is the approximate pH of a 0.005 M solution of anilinium chloride (C 5 H 5 NH 3 Cl)? For #3 - #6: Consider hypobromous acid (HBrO), which has an acid dissociation constant, K a = 2.0x10 -9 . 3. What is the pH of a 0.20 M solution of aqueous hypobromous acid? 4. What is the pH of a 0.20 M solution of aqueous potassium bromite (HBrO)? 5. What is the pH of a solution after 0.20 moles of HCl are added to a 2 L solution of a 0.40 M solution of potassium bromite? (A) 8.2 (B) 4.8 (C) 9.2 (D) 5.8 6. What is the value of the ratio, [HBrO]/[BrO - ] at pH = 9.1: 7. In class, we discussed the buffering action of the CO 2 /HCO 3 - and Hemoglobin (Hb) buffers in controlling the pH in blood? Which of the following statements is/are true? (i) Because the principal metabolism products are carboxylic acids, the large excess of CO 2 relative to HCO 3 - , makes this a suitable buffer to remove the added acid. (ii) CO 2 produced in the muscles raises the pH of the blood, which is then lowered by the Hb buffer. (iii) The Hb molecules in blood transport the CO 2 produced by exercise from the muscles to the lungs.
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