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midterm1_sp08

# midterm1_sp08 - 1[7 points The solubility product...

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1. [7 points] The solubility product expression for Pb 3 (PO 4 ) 2 (s) is (a) [3 Pb 2+ ] 3 [2 PO 4 3– ] 2 (b) [Pb 2+ ] 2 [PO 4 3– ] 3 (c) [3 Pb 2+ ] 3 [2 PO 4 3– ] 2 /[Zn 3 (PO 4 ) 2 ] (d) [3 Pb 2+ ][2 PO 4 3– ] (e) [Pb 2+ ] 3 [PO 4 3– ] 2 2. [7 points] What is the molar solubility of Ag 2 CO 3 in water? (K sp = 8.1 x 10 –12 ) 3. [7 points] Which of the following slightly soluble salts has the largest molar solubility in aqueous solution? 4. [7 points] Which of the following slightly soluble salts would not be more soluble in acidic solution?

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5. [7 points] Calculate the molar solubility of Cd(OH) 2 when buffered at a pH = 12.30. The K sp for Cd(OH) 2 is 2.5 x 10 –14 . (a) 8.5 x 10 –6 M (b) 6.3 x 10 –11 M (c) 1.3 x 10 –12 M (d) 5.0 x 10 –2 M (e) 1.8 x 10 –5 M 6. [7 points] A solution contains 0.015 M AsO 4 3– , 0.010 M I , and 0.005 M CO 3 2– . If AgNO 3 is slowly added, in what order would the silver salts precipitate? Ag 3 AsO 4 , K sp = 1.0 x 10 –22 AgI, K sp = 8.3 x 10 –17 Ag 2 CO 3 K sp = 8.1 x 10 –12 7. [7 points] What is the concentration of free cobalt ion if 5.25 x 10 –4 moles of Co(NO 3 ) 2 is added to 1.00 L of 3.0 M NH 3 solution? The K f for the formation of Co(NH 3 ) 6 2+ is 8.3 x 10 4 . (a) 2.1 x 10 –9 M (b) 3.2 x 10 –4 M (c) 5.3 x 10 –4 M (d) 8.7 x 10 –12 M (e) 1.2 x 10 –5 M
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midterm1_sp08 - 1[7 points The solubility product...

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