homework7 - savage (jws775) Homework #7 Holcombe (52460) 1...

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Unformatted text preview: savage (jws775) Homework #7 Holcombe (52460) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Consider a solution that is 0.10 M in a weak triprotic acid which is represented by the gen- eral formula H 3 A with the following ionization constants: K 1 = 1 . 10- 3 , K 2 = 1 . 10- 8 , K 3 = 1 . 10- 12 . Which species is present in the lowest concentration in 0.10 M H 3 A solution? 1. HA 2- 2. H 3 O + 3. OH- 4. A 3- correct 5. H 3 A Explanation: 002 10.0 points Which of the following would be equal to K a 3 for orthocarbonic acid, H 4 CO 4 ? 1. [H + ] 3 [HCO 3- 4 ] [H 2 CO 2- 4 ] 2. [H + ] [HCO 3- 4 ] [H 2 CO 2- 4 ] correct 3. [H 4 CO 4 ] [H + ] 3 [HCO 3- 4 ] 4. [H 2 CO 2- 4 ] [H + ] [HCO 3- 4 ] 5. [H + ] 3 [HCO 3- 4 ] [H 4 CO 4 ] Explanation: K a 3 for orthocarbonic acid, H 4 CO 4 , describes the 3 rd deprotonation event....
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homework7 - savage (jws775) Homework #7 Holcombe (52460) 1...

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