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# Exam 3 - View Attempt 1 of 1 Title Started Submitted Time...

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View Attempt 1 of 1 Title: Exam 3 Started: April 27, 2011 2:27 PM Submitted: April 27, 2011 3:25 PM Time spent: 00:57:56 Total score: 18/20 = 90% Total score adjusted by 0.0 Maximum possible score: 20 1. Calculate the pH of a solution prepared by adding 20.0 mL of 0. 80.0 mL of a buffer that is comprised of 0.25 M NH K b of NH 2 NH 2 = 1.3 x 10 -6 . Student Response A. 8.20 B. 8.11 C. 5.80 D. 8.03 E. 5.97 Score: 1/1 2. Determine K for the reaction, H 2 C 2 O 4 (aq) + 2 OH - (aq) <=> C 2 O 4 2- (aq) + 2 H 2 O(l) given that, for H 2 C 2 O 4 (aq), K a1 = 6.5 x 10 -2 and K K w = 1 x 10 -14 ! Student Response A. 4 x 10 22 B. 4 x 10 -34 C. 4 x 10 6 D. 4 x 10 34 E. 4 x 10 -6 Score: 1/1

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3. Calculate the aqueous solubility of Fe(OH) 2 in grams per liter. K Student Response A. 1.4 x 10 -3 B. 9.1 x 10 -4 C. 1.0 x 10 -5 D. 1.6 x 10 -5 E. 6.4 x 10 -8 Score: 1/1 4. Under what conditions will the exothermic reaction, 2 Cu(s) + O CuO(s), be spontaneous? Student Response A. at high temperatures B. there is not enough information to answer this question. C. it will never be spontaneous D. it will always be spontaneous E. at low temperatures Score: 1/1 5. Which of the following solutions would be described as a buffer Student Response A. 0.25 M CH 3 COOH and 0.2 M HCl
Student Response B. 0.25 M NH 3 and 0.15 M NaOH C. 0.15 M NaBr and 0.20 M HBr D. 0.25 M HCl and 0.10 M NaOH E. 0.25 M CH 3 COOH and 0.2 M NaOH Score: 1/1 6.

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Exam 3 - View Attempt 1 of 1 Title Started Submitted Time...

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