Quiz 7 Weak Acid Buffer-solutions

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

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Version 069/ABABB – Quiz 7 Weak Acid Bufer – lyon – (51155) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore 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 o± the weak acid. A 0.200 M solution o± a weak monoprotic acid HA is ±ound to have a pH o± 3.00 at room temperature. What is the ionization constant o± 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 ±ollowing solutions are comprised o± an acid and the salt o± an acid. The ±ollowing 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) bufer 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 o± a weak acid. HBrO and KBr are a weak acid and the salt o± 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 ±or hand grading. ²or which o± the ±ollowing reasons will Dr. Lyon re±use to hand grade a quiz? 1. The batteries die in a student’s iClicker.
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Quiz 7 Weak Acid Buffer-solutions - Version 069/ABABB Quiz...

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