e3-132-f10 - Exam 3, CHE 132 Fall 2010 Multiple Choice, 5...

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Exam 3, CHE 132 Fall 2010 Multiple Choice, 5 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. Which of the following statements is incorrect ? A. The oxidation number of phosphorus in P 4 is 0. B. The oxidation number of aluminum in Al 2 O 3 is +3. C. The oxidation number of H in NaH is +1. D. The oxidation number of manganese in MnO 4 is +7. E. The oxidation number of iron in SF 4 is +4. ____ 2. What is the pH of a 0.400 mol L –1 solution of aniline, C 6 H 5 NH 2 , in water. C 6 H 5 NH 2 (aq) + H 2 O C 6 H 5 NH 3 + (aq) + OH (aq) pK b (C 6 H 5 NH 2 ) = 9.13. A. 4.76 B. 7.00 C. 9.24 D. 4.87 E. 9.13 ____ 3. The K sp expression for strontium fluoride, SrF 2 , is A. [Sr 2+ ] [F ] 2 B. [Sr 2+ ] 2 [F ] 2 C. [Sr 2+ ] [F ] D. [Sr 2+ ] 2 [F ] E. 2 [Sr 2+ ] [F ] ½
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4. Lithium phosphate, Li 3 PO 4 , is a sparingly soluble salt in water that dissolves according to the reaction Li 3 PO 4 (s) 3 Li + (aq) + PO 4 3– (aq) A handbook lists the solubility of lithium phosphate as 0.034 g of Li 3 PO 4 / 100.0 mL of solution at 18 °C. What is the solubility product constant K sp of lithium phosphate at that temperature? M (Li 3 PO 4 ) = 115.7944 g mol –1 . A. 7.47 × 10 7 B. 7.47 × 10 11 C. 2.02 × 10 5 D. 2.02 × 10 9 E. 7.47 × 10 17 ____ 5. In the titration of a strong base with a strong acid, which one of the following statements is correct ? A. The pH of the sample solution is smaller than 7 before the equivalence point is reached. B. As the titration progresses, the titrant solution is being diluted. C. To improve the accuracy of the titration, the concentration of the indicator must be as large as possible. D. When the concentration of the sample is equal to the concentration of the titrant, the titrated solution at the equivalence point is basic. E. A good indicator for such titration would change from colorless to violet at pH
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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e3-132-f10 - Exam 3, CHE 132 Fall 2010 Multiple Choice, 5...

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