Exam-2-D - 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. Calculate the pH of a solution made by mixing 100.0 mL of 0.658 M NH 3 with 100.0 mL of 0.100 M HCl. ( K b for NH 3 = 1.8 10-5 .) A) 9.26 B) 10.00 C) 4.00 D) 8.51 E) none of these 2. Calculate the pH of a 0.14 M solution of NaC 2 H 3 O 2 (for HC 2 H 3 O 2 K a = 1.8 10-5 ). A) 8.95 B) 8.40 C) 5.60 D) 5.05 E) none of these Use the following to answer questions 3-4. Given the equation 2A(g) 2B(g) + C(g). At a particular temperature, K = 1.6 10 4 . 3. Raising the pressure by lowering the volume of the container will A) have no effect. B) cause [A] to increase. C) cause [B] to increase. D) cannot be determined. E) none of the above. Page 1 4. Addition of chemical B to an equilibrium mixture of the above will A) cause [C] to increase. B) have no effect. C) cause [A] to increase. D) cannot be determined. E) none of the above. 5. 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) 12 mL B) 5.0 mL C) 25 mL D) 30. mL E) 60. mL 6. Consider the reaction: CaCl 2 (s) + 2H 2 O(g) CaCl 2 2H 2 O(s) The equilibrium constant for the reaction as written is A) K = B) C) K = D) E) K = [H 2 O] 2 4. Addition of chemical B to an equilibrium mixture of the above will A) cause [C] to increase. B) have no effect. C) cause [A] to increase. D) cannot be determined. E) none of the above. 5. 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) 12 mL B) 5.0 mL C) 25 mL D) 30. mL E) 60. mL 6. Consider the reaction: CaCl 2 (s) + 2H 2 O(g) CaCl 2 2H 2 O(s) The equilibrium constant for the reaction as written is A) K = B) C) K = D) E) K = [H 2 O] 2 Page 2 7. At -80C, K for the reaction is 4.66 is 4....
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Exam-2-D - Fall 2010 CHEMISTRY 104 Section 001 Exam 2 Name:

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