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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 = 7.9 x10 -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)? From the study outline : "Be able to calculate the pH or hydrogen ion concentration of a buffer solution
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