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

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Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name: ______________________ ID: XXX-XX-_ ______ Seat #: ___ 1. The pH of a solution at 25°C 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? 3. The molar solubility of PbI 2 is 1.48 × 10 -3 M. Calculate the value of K sp for PbI 2 . Page 1
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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? 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:
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