CH8 - Howard (clh2528) H08: Buffers mccord (51620) 1 This...

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Unformatted text preview: Howard (clh2528) H08: Buffers mccord (51620) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which of the five solutions below is most ba- sic? 1. 0.10 M CH 3 COOH and 0.20 M NaCH 3 COO 2. 0.10 M aq NH 3 and 0.10 M NH 4 Cl 3. 0.10 M CH 3 COOH and 0.10 M NaCH 3 COO 4. 0.10 M HClO and 0.10 M NaClO 5. 0.10 M aq NH 3 and 0.20 M NH 4 Cl 002 10.0 points Explain why the salt of a weak acid, as well as the acid itself, must be present to form a buffer solution. 1. Actually, a weak acid by itself is a buffer; no salt is needed. 2. The anion from the salt is needed to partially neutralize added acid. 3. The cation from the salt is needed to partially neutralize added acid. 4. The cation from the salt is needed to partially neutralize added base. 5. The anion from the salt is needed to partially neutralize added base. 003 10.0 points What is the pH of an aqueous solution that is 0.018 M C 6 H 5 NH 2 ( K b = 4 . 3 10- 10 ) and 0.12 M C 6 H 5 NH 3 Cl? 1. 5.46 2. 10.19 3. 4.02 4. 9.37 5. 8.54 6. 3.81 7. 2.87 8. 4.63 004 10.0 points A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0...
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CH8 - Howard (clh2528) H08: Buffers mccord (51620) 1 This...

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