chem 1332 fall10 - test 3

chem 1332 fall10 - test 3 - Blackboard Learning System...

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11/23/10 7:04 PM Blackboard Learning System Page 1 of 8 https://learn.uh.edu/webct/urw/lc5122011.tp0/cobaltMainFrame.dowebct View Attempt 1 of 1 Title: Exam 3 Started: November 23, 2010 2:19 PM Submitted: November 23, 2010 3:36 PM Time spent: 01:16:52 Total score: 18/20 = 90% Total score adjusted by 0.0 Maximum possible score: 20 Done 1. Determine the pH of a solution in which 40.0 mL of 0.2 M aqueous propanoic acid (K a = 1.30 x 10 -5 ) has been titrated with 10.0 mL of 0.2 M KOH. Student Response Value Correct Answer A. 4.41 100% B. 8.64 C. 5.36 D. 2.79 E. 9.59 Score: 1/1 2. Determine the pH of a solution in which 40.0 mL of 0.2 M aqueous acetic acid (K a = 1.8 x 10 -5 ) has been titrated with 40.0 mL of 0.1 M NaOH(aq). Student Response Value Correct Answer A. 1.8 x 10 -5 B. 11.28 C. 9.26 D. 2.72 E. 4.74 100% Score: 1/1 3. How many moles of NaOCl must be added to 150. mL of 0.0250 M HOCl solution to make a Your location: Home Page Exams and Keys Exam 3 Assessments View All Submissions View Attempt
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11/23/10 7:04 PM Blackboard Learning System Page 2 of 8 https://learn.uh.edu/webct/urw/lc5122011.tp0/cobaltMainFrame.dowebct buffer of pH 7.60 if the K a of HOCl is 2.8 x 10 -8 ? Student Response Value Correct Answer A. 1.11 B. 2.8 x 10 -2 C. 4.2 x 10 -3 100% D. 2.2 x 10 -2 E. 3.4 x 10 -3 Score: 1/1 4. During the titration of a weak base (K b = 1 x 10 -10 ) with a strong acid, one should use an acid- base indicator that changes color in the pH range Student Response Value Correct Answer A. 5-7 B. 7-9 C. 10-13 D. 6-8 E. 2-4 100% Score: 1/1 5. Which of the following processes does not have a positive value of delta S?
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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 1332 fall10 - test 3 - Blackboard Learning System...

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