Exam-2-B - Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name:

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Unformatted text preview: Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name: ______________________ ID: XXX-XX-_ ______ Seat #: ___ 1. The pH of a solution at 25C in which [OH- ] = 3.9 10-5 M is: A) 4.80 B) 9.59 C) 4.41 D) 3.90 E) none of these 2. A solution contains 25 mmol of H 3 PO 4 and 10. mmol of NaH 2 PO 4 . What volume of 2.0 M NaOH must be added to reach the second equivalence point of the titration of the H 3 PO 4 with NaOH? A) 5.0 mL B) 60. mL C) 12 mL D) 30. mL E) 25 mL 3. The molar solubility of PbI 2 is 1.48 10-3 M. Calculate the value of K sp for PbI 2 . A) 1.30 10-8 B) 3.24 10-9 C) 4.38 10-6 D) 1.48 10-3 E) none of these Page 1 Use the following to answer question 4. The questions below refer to the following system: Co(H 2 O) 6 2+ + 4 Cl <==> CoCl 4 2 + 6 H 2 O (pink) (blue) Cobalt chloride is added to pure water. The Co 2+ ions hydrate. The hydrated form then reacts with the Cl ions to set up the equilibrium shown here: 4. Which statement below describes the change that the system will undergo if water is added? A) The equilibrium will shift to the right. B) There will be less of the hydrated cobalt ion at the new equilibrium position. C) More water will be produced. D) More chlorine ions will be produced. E) The color will become more blue. Use the following to answer questions 5-6. Determine whether the following oxides produce A) an acidic solution when dissolved in water:, B) a basic, solution when dissolved in water, C) a neutral solution when dissolved in water: 5. K 2 O 6. SO 2 Use the following to answer question 4. The questions below refer to the following system: Co(H 2 O) 6 2+ + 4 Cl <==> CoCl 4 2 + 6 H 2 O (pink) (blue) Cobalt chloride is added to pure water. The Co 2+ ions hydrate. The hydrated form then reacts with the Cl ions to set up the equilibrium shown here: 4. Which statement below describes the change that the system will undergo if water is added?...
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This note was uploaded on 02/25/2011 for the course CHEM 222 taught by Professor Harding during the Fall '08 term at CUNY Hunter.

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Exam-2-B - Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name:

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