103B Exam 2-D - Exam I master Page 1 Chemistry 103B Exam 2...

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Page 1 Exam I master 4/10/2008 12:21:35 AM http://www.chem.arizona.edu/~kellerp/exams/Exam2/exam2Dan/Exam2Dan.htm Chemistry 103B Exam 2 Form D Answer Key 1. (2) Which acid/conjugate base pair would be best for making a buffer solution with pH = 3.00? (a) H 3 PO 4 / H 2 PO 4 - (b) HCO 3 /CO 3 2- (c) H 2 CO 3 /HCO 3 - (d) HCN/CN - (e) CH 3 OH/CH 3 O - Essentially from the d2l practice test. 2. (2) Lead(II) iodide, PbI 2 (s), has K sp =7.9x10 -9 . What is the concentration of iodide ion, I - (aq), in a saturated solution of PbI 2 ? (a) 1.3e-3 M (b) 2.5e-3 M (c) 2.0e-3 M (d) 6.3e-5 M (e) 1.3e-4 M From the study outline : " Computation of the equilibrium concentrations of ions in a saturated solution of an ionic compound ." 3. (2) A water solution has a pOH of 0.00. This means: (a) The solution is neutral. (b) the hydroxide ion concentration is 1.00 mol/L (c) There is no hydronium ion present . (d) There is no hydroxide ion present . (e) none of these . Definition of pOH 4. (2) What is the pH of a buffer solution that consistes of 0.10 M HCO 3 - (aq) and 0.95 M CO 3 -2 (aq)? (a) 8.80 (b) 11.29 (c) 7.27 (d) 4.66 (e) 9.33 From th stud outlin "B able to calculat the pH o hydrogen io concentratio of a buffer solutio
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Page 2 Exam I master 4/10/2008 12:21:35 AM http://www.chem.arizona.edu/~kellerp/exams/Exam2/exam2Dan/Exam2Dan.htm From the study outline : "Be able to calculate the pH or hydrogen ion concentration of a buffer solution given the equilibrium concentrations of the weak acid, its conjugate base and the appropriate K a ." 5. (2) A pH value less than 1.00 means (a) [H 3 O + ]>0.10 M (b) [H 3 O + ]<0.10 M (c) [OH - ] > 0.10 M (d) [OH - ]>10 -13 M (e) none of these 6. (2) Choose the strongest acid. (a) (b) (c) (d) (e) From the study outline : "Understand how the strength of an oxyacid depends upon molecular structure ." 7. (2) ) A diprotic acid H 2 A has K a1 =4.0x10 -9 and K a2 =6.0x10 -13 . In a 0.10 mol/L solution of this acid, what is [A 2- ]?
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This test prep was uploaded on 04/10/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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103B Exam 2-D - Exam I master Page 1 Chemistry 103B Exam 2...

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