Chem_Exam_3 - View Attempt

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View Attempt 1 of 1 Title: Exam 3 Started: November 23, 2010 5:27 PM Submitted: November 23, 2010 6:45 PM Time spent: 01:18:12 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 50.0 mL of 0.3 M aqueous acetic acid (K a = 1.8 x 10 -5 ) has been titrated with 10.0 mL of 0.3 M NaOH. Student Response Value Correct Answer A. 8.65 B. 2.63 C. 5.35 D. 9.86 E. 4.14 100% Score: 1/1 2. Determine the pH of a solution in which 50.0 mL of 0.2 M aqueous formic acid (K a = 1.8 x 10 -4 ) has been titrated with 25.0 mL of 0.2 M NaOH(aq). Student Response Value Correct Answer A. 11.78 B. 2.22 C. 3.74 100% D. 10.26 E. 1.8 x 10 -4 Score: 1/1 3. Your location: Assessments View All Submissions › View Attempt View Attempt https://learn.uh.edu/webct/urw/lc2174044722021.tp217404474. .. 1 of 8 12/5/10 12:27 PM
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How many moles of NaOCl must be added to 150. mL of 0.0250 M HOCl solution to make a buffer of pH 7.40 if the K a of HOCl is 2.8 x 10 -8 ? Student Response Value Correct Answer A. 3.6 x 10 -2 B. 2.6 x 10 -3 100% C. 5.3 x 10 -3 D. 1.8 x 10 -2 E. 0.70 Score: 1/1 4. During the titration of a weak acid (K a = 1 x 10 -10 ) with a strong base, one should use an acid-base indicator that changes color in the pH range Student Response Value Correct Answer A. 6-8 B. 7-9 C. 5-7 D. 2-4 E. 10-13 100% Score: 1/1 5. Which of the following processes has a negative value of delta S? Student Response Value Correct Answer A.
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Chem_Exam_3 - View Attempt

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