Exam 2 2007 - Name Chemistry 112 Exam 2 Question 1 2 3 4 5...

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Name _________________________ Chemistry 112 Exam 2 March 13, 2006 Question Points Possible Points Earned 12 0 22 4 31 5 41 5 51 6 61 0 Total 100
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1. How many g of NaOH and C 6 H 7 NHCl are needed to produce 2.0 L of a buffer with pH = 4.50 and a concentration of 0.500 M? K b for C 6 H 7 N = 3.98 x 10 -10 . (20 points)
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2. a. What is the pH of a 0.00125 M solution of HNO 3 ? b. What is the pH of a 1.25 M solution of NaNO 2 ? K a for HNO 2 = 7.1 x 10 -4 ? c. What is the pH of a solution of 0.250 M NaNO 2 and 0.125 M HNO 3 ? (24 points)
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3.a. What is the molar solubility of Co(OH) 3 in a solution with a pH = 9.50? K sp for Co(OH) 3 = 1.6 x 10 -44 . b. How many Co +3 ions does this correspond to in a 100.0 mL solution? (15 points)
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O O F F F H O O Cl Cl Cl H or or H Br H I or HO I O O O HO Cl O O O 4. a. Circle the most acidic of the pair and give a chemical explanation as to why. (15 points)
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5. Circle which solutions below would produce buffers. (16 points) a.0.10 mol NaC 6 H 4 O and 0.25 mol HCl in 1.0 L of water
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Exam 2 2007 - Name Chemistry 112 Exam 2 Question 1 2 3 4 5...

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