midterm1a_sp07 - 1[7 points It takes 0.098 g of silver...

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1. [ 7 points ] It takes 0.098 g of silver iodate, AgIO 3 , to make 1.00-L of a saturated solution saturated at 25 ° C. What is the value of the solubility product, K sp ? a. 3.5 × 10 –4 b. 1.2 × 10 –7 c. 9.8 × 10 –2 d. 9.6 × 10 –3 e. 1.6 × 10 –9 2. [ 7 points ] The K sp for PbCl 2 is 1.7 × 10 –5 . Determine the molar solubility of PbCl 2 ? a. 0.068 M b. 4.1 × 10 –3 M c. 2.9 × 10 –3 M d. 0.016 M e. 0.026 M 3. [ 7 points ] What is the molar solubility of PbI 2 (K sp = 2.5 × 10 –7 ) in a 0.100 M NaI solution? 4. [ 7 points ] Which of the following reagents would decrease the solubility of AgCl(s)? NaOH HCl NH 3 NaCN
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5. [7 points] Given the fact that K sp = 6.7 × 10 –31 for Cr(OH) 3 , and that the formation constant for the complex ion, Cr(OH) 4 , is K f = 8.0 × 10 29 . What is the concentration of the complex ion Cr(OH) 4 in a solution that is buffered at pH = 11 and is in equilibrium with solid Cr(OH) 3 ? 6. [7 points] What is the concentration of free Ni 2+ , if 1.83 g of Ni(NO 3 ) 2 is dissolved in 1.00 L of 3.0 M NH 3 solution? [The formation constant for the formation of the complex ion Ni(NH 3 ) 6 2+ is 1.2 × 10 9 .] a. 2.1 × 10 –12 b. 1.1 × 10 –10 c. 6.1 × 10 –14 d. 2.8 × 10 –12 e. 1.3 × 10 –14 7. [7 points] An amphoteric oxide (i.e. ZnO) is an oxide that ___________. a. Dissolves in strongly acidic solution, but not strongly basic solution b. Dissolves in strongly basic solution, but not strongly acidic solution c. Dissolves in both strongly acidic and strongly basic solutions d. Only dissolves when the pH is nearly neutral e. Sleeps with both metals and nonmetals 8. [7 points] In the laboratory you add 0.25 g of Ca(OH) 2 to 500 mL of H 2 O and stir the solution. After 2 minutes the solid has completely dissolved. The solution is then divided into three beakers. To each of these beakers you add 100 mL of the following solutions: Beaker 1: 100 mL of 6 M HCl solution Beaker 2: 100 mL of 6 M NaCl solution Beaker 3: 100 mL of 6 M CaCl 2 solution This leads to the formation of a white precipitate in which of the beakers?
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