Chemistry 103B Exam 2 answer key 2

Chemistry 103B Exam 2 answer key 2 - Chemistry 103B Exam 2...

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Chemistry 103B Exam 2 Answer Key Form B 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 = 7.9e-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 pH of 0.00. This means: (a) The solution is neutral. (b) the hydrogen ion concentration is 1.00 mol/L (c) There is no hydronium ion present. (d) There is no hydroxide ion present. (e) The hydrogen ion concentration is 0.00 mol/L. Definition of pH 4. (2) What is [H 3 O + ] of a buffer solution that consistes of 0.10 M HF(aq) and 0.95 M NaF(aq)? (a) 6.8e-3 M (b) 7.6e-5 M (c) 7.2e-4 M (d) 1.5e-12 M (e) 1.3e-10 M
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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) Which of the 0.10 mol/L solutions will have a pH greater than 13.00? (a) KCH 3 (aq) (b) KH(aq) (c) KCH 3 O(aq) (d) KOH(aq) (e) Ca(OH) 2 (aq) From the study outline: "Be able to explain why a 0.10 mol/L solution of sulfuric acid has a lower pH than a 0.10 mol/L solution of hydrochloric acid." same principle here. 6. (2) Choose the strongest acid. (a)
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This note was uploaded on 04/07/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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Chemistry 103B Exam 2 answer key 2 - Chemistry 103B Exam 2...

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