chem hw 7 - lawrence(cdl678 Homework#7 Holcombe(52460 This...

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lawrence (cdl678) – 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 . 0 × 10 - 3 , K 2 = 1 . 0 × 10 - 8 , K 3 = 1 . 0 × 10 - 12 . Which species is present in the lowest concentration in 0.10 M H 3 A solution? 1. HA 2 - 2. H 3 A 3. H 3 O + 4. OH - 5. A 3 - correct 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 4 CO 4 ] [H + ] 3 · [HCO 3 - 4 ] 2. [H 2 CO 2 - 4 ] [H + ] · [HCO 3 - 4 ] 3. [H + ] · [HCO 3 - 4 ] [H 2 CO 2 - 4 ] correct 4. [H + ] 3 · [HCO 3 - 4 ] [H 2 CO 2 - 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. H 2 CO 2 - 4 H + + HCO 3 - 4 003 10.0 points Determine the pH of a 0 . 4 M solution of NaHCO 3 . Assume H 2 CO 3 has a p K a 1 of 3.60 and a p K a 2 of 10.4.
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