Quiz 7 Weak Acid Buffer-solutions

Quiz 7 Weak Acid Buffer-solutions - Version 069/ABABB Quiz...

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Unformatted text preview: Version 069/ABABB Quiz 7 Weak Acid Buffer lyon (51155) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 1 2 3 4 5 6 7 AA AB AC AD BA BB BC 8 9 10 BACK NEXT BD CA CB CC CD 001 10.0 points Assume that the [weak acid] is much greater than ionization of the weak acid. A 0.200 M solution of a weak monoprotic acid HA is found to have a pH of 3.00 at room temperature. What is the ionization constant of this acid? 1. 5.0 10- 3 2. 2.0 10- 5 3. 1.0 10- 3 4. 1.8 10- 5 5. 5.30 6. 1.0 10- 6 7. 2.0 10- 9 8. 5.0 10- 6 correct Explanation: 002 10.0 points The following solutions are comprised of an acid and the salt of an acid. The following solutions are mixed in equal volumes. I) 0.1 M HBr and 0.1 M KBr II) 0.1 M HBr and 0.1 M KBrO III) 0.1 M HBrO and 0.1 M KBr IV 0.1 M HBrO and 0.1 M KBrO Which will give (a) buffer solution(s)? 1. I only 2. I and II only 3. III and IV only 4. IV only correct 5. II and III only Explanation: HBr and KBr are a strong acid and its salt, so this choice can be eliminated. HBr and KBrO are a strong acid and the salt of a weak acid. HBrO and KBr are a weak acid and the salt of a strong acid. HBrO and KBrO are a weak acid conjugate base pair. 003 10.0 points Dr. Lyon allows students to submit one quiz hard copy for hand grading. For which of the following reasons will Dr. Lyon refuse to hand grade a quiz? 1. The batteries die in a students iClicker....
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Quiz 7 Weak Acid Buffer-solutions - Version 069/ABABB Quiz...

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