Test3b_Spring_2009 - View Attempt 1 of 1 Title: Started:...

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View Attempt 1 of 1 Title: Exam 3 Started: April 28, 2009 8:46 AM Submitted: April 28, 2009 9:52 AM Time spent: 01:05:53 Total score: 18/20 = 90% Total score adjusted by 0.0 Maximum possible score: 20 1. Chapter 11 Ksp S 2 What is the solubility in moles/liter for barium sulfate at 25 o C given a K sp value of 1.1 x 10 -10 . Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!) Student Response Value Correct Answer 1. 1.0E-5 100% Equals 1.05e-5 (100%) Equals 1.1e-5 (100%) Equals 1.0e-5 (100%) General Feedback: K sp = S 2 Score: 1/1 2. CIE 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 Value Correct Answer Feedback a. 2.8 x 10 - 16 100% b. 2.7 x 10 -6 0% c. 5.5 x 10 - 16 0%
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d. 3.7 x 10 - 15 0% e. 9.1 x 10 -9 0% Score: 1/1 3. Chapter 11 Precipitate 20 The K sp of CaF 2 at 25 o C is 4 x 10 -11 . Consider a solution that is 1.0 x 10 -4 M Ca(NO 3 ) 2 and 3.0 x 10 -4 M NaF. Student Response Value Correct Answer Feedback 1. Q > K sp and a precipitate will form. 0% 2. Q > K sp and a precipitate will not form. 0% 3. Q < K sp and a precipitate will not form. 100% 4. Q < K sp and a precipitate will form. 0% 5. The solution is saturated. 0% Score: 1/1
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4. Serial Precipitation 13 A solution is 0.40 M AgNO 3 and 0.30 M Sr(NO 3 ) 2 . If solid Na 2 SO 4 is added to the solution, what is [Sr 2+ ] when Ag 2 SO 4 begins to precipitate?(K sp SrSO 4 = 3.2 x 10 -7 ; Ag 2 SO 4 = 1.1 x 10 -5 ) Student Response Value Correct Answer Feedback a. 4.7 x 10 -3 100% b. 3.3 x 10 -3 0% c. 5.7 x 10 -4 0% d. 6.9 x 10 -5 0% e. 1.1 x 10 -6 0% Score: 1/1 5. pH Solubility 2
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This note was uploaded on 01/29/2011 for the course CHEM 1332 taught by Professor Shiv during the Spring '08 term at University of Houston.

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Test3b_Spring_2009 - View Attempt 1 of 1 Title: Started:...

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