chm 2046 exam 2 key

chm 2046 exam 2 key - CHM 2046 / Prof. C. R. Martin EXAM 2...

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CHM 2046 / Prof. C. R. Martin EXAM 2 FORM A 3/6/2008 1. Determine the value of the equilibrium constant for the following reaction: AgBr (s) + 2S 2 O 3 2- (aq) ↔ Ag(S 2 O 3 ) 2 3- (aq) + Br - (aq) Use the data for the following two reactions: AgBr (s) ↔ Ag + (aq) + Br - (aq) K sp = 5.4×10 -13 Ag + (aq) + 2S 2 O 3 2- (aq) ↔ Ag(S 2 O 3 ) 2 3- (aq) K f = 2.0×10 13 a. 2.7×10 -26 b. 2.0×10 13 c. 1.0 × 10 1 d. 5.4×10 -13 e. 3.7×10 25 2. The K a of benzoic acid is 1×10 -5 . Which of the following would you choose as a pH = 4.0 buffer? a. A 1.0 M solution of benzoic acid b. A 1.0 L solution containing 1.0 mole of benzoic acid and 1.0 mole of sodium benzoate. c. A 1.0 L solution containing 1.0 mole of benzoic acid and 0.10 mole of sodium benzoate. d. A 1.0 L solution containing 0.10 mole of benzoic acid and 1.0 mole of sodium benzoate. e. A 1.0 L solution containing 0.10 mole of benzoic acid and 0.20 mole of sodium benzoate 3. What is the solubility of Pb 3 (AsO 4 ) 2 (s) [Ksp = 4.1×10 -36 ] in a solute that is 0.02 M in Pb(NO 3 ) 2 ? a. 5.6×10 -16 b. 3.6 × 10 -16 c. 8.0×10 -6 d. 7.2×10 -16 e. 4.1×10 -13 4. Which of the following equations best describes what takes place when the equivalence point is reached in the titration of the weak base ClO - (aq) with hydrobromic acid? a.
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This note was uploaded on 04/24/2008 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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chm 2046 exam 2 key - CHM 2046 / Prof. C. R. Martin EXAM 2...

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