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# Test 3 - View Attempt 1 of 1 Title Exam 3 noon Started...

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View Attempt 1 of 1 Title: Exam 3 noon Started: August 5, 2010 12:01 PM Submitted: August 5, 2010 1:17 PM Time spent: 01:16:15 Total score: 8/20 = 40% Total score adjusted by 0.0 Maximum possible score: 20 1. Determine the pH of a solution in which 40.0 mL of 0.2 M aqueous HF (K a = 7.4 x 10 -4 ) has been titrated with 10.0 mL of 0.2 M LiOH. Student Response Value Correct Answer A. 11.35 B. 10.39 C. 2.65 100% D. 3.61 E. 1.91 Score: 1/1 2. Determine the pH of a solution in which 20.0 mL of 0.2 M aqueous acetic acid (K a = 1.8 x 10 -5 ) has been titrated with 10.0 mL of 0.2 M NaOH(aq). Student Response Value Correct Answer A. 9.26 B. 1.8 x 10 -5 C. 11.28 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 buffer of pH 7.50 if the K a of HOCl is 2.8 x 10 -8 ?

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Student Response Value Correct Answer A. 4.2 x 10 -3 B. 0.885 C. 3.3 x 10 -3 D. 2.2 x 10 -2 0% E. 2.8 x 10 -2 Score: 0/1 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. 2-4 0% D. 5-7 E. 10-13 Score: 0/1 5. What is the pH of a saturated solution of manganese(II) hydroxide (K sp = 2.0 x 10 -13 )?
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Test 3 - View Attempt 1 of 1 Title Exam 3 noon Started...

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