Chem_2_FALL_2009_Test_3[1]

Chem_2_FALL_2009_Test_3[1] - TEST 3 1. At 25 oC the...

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TEST 3 1. At 25 o C the solubility of magnesium hydroxide is 1.40 x 10 -4 mol/L. Calculate the value of K sp at this temperature. Give your answer in scientific notation to 2 SIGNIFICANT FIGURES (even though this is strictly incorrect). Student Response Valu e Correct Answer 1. 1.96E-8 0% Equals 1.1e-11 (100%) General Feedback: K sp = 4S 3 Score: 0/1 2. What is the solubility of silver iodide (K sp = 8.3 x 10 -17 ) in a solution of 0.15 M magnesium iodide? Student Response Valu e Correct Answer Feedback a. 2.8 x 10 - 16 100% b. 2.7 x 10 -6 0% c. 5.5 x 10 - 16 0% d. 3.7 x 10 - 15 0% e. 9.1 x 10 -9 0% Score: 0/1 3.
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The K sp of AgCl at 25 o C is 1.6 x 10 -10 . Consider a solution that is 1.0 x 10 -8 M CaCl 2 and 1.0 x 10 -2 M AgNO 3 . Student Response Valu e Correct Answer Feedback 1. Q > K sp and a precipitate will form. 100% 2. Q > K sp and a precipitate will not form. 0% 3 . Q < K sp and a precipitate will not form. 0% 4. Q < K sp and a precipitate will form. 0% 5. The solution is saturated. 0% Score: 0/1 4. A solution is 0.20 M HgNO 3 and 0.20 M Pb(NO 3 ) 2 . If solid Na 2 CO 3 is added to the solution, what is [Pb 2+ ] when Hg 2 CO 3 begins to precipitate?(K sp PbCO 3 = 7.4 x 10 -14 ; Hg 2 CO 3 = 8.9 x 10 -6 ) Student Response Valu e Correct Answer Feedback a. 3.3 x 10 - 10 100%
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b. 3.0 x 10 -3 0% c. 2.7 x 10 -7 0% d. 2.2 x 10 -4 0% e. 3.7 x 10 - 13 0% Score: 1/1 5. Which of the following compounds will not have a different solubility with a change in pH? Student
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This note was uploaded on 11/25/2011 for the course CHEM 318 taught by Professor Rankin during the Spring '11 term at University of Texas at Austin.

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Chem_2_FALL_2009_Test_3[1] - TEST 3 1. At 25 oC the...

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