Fall 2009 Exam 3 Practice v2 _Zumdahl Chapters 8,9,10_ no answer key

Fall 2009 Exam 3 Practice v2 _Zumdahl Chapters 8,9,10_ no answer key

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Practice Exam 3 v2 (Zumdahl Chapters 8, 9, 10) Page 1 1. Calculate the pH of a solution prepared by mixing 50 mL of a 0.10 M solution of HF with 25 mL f a 0.20 M solution of NaF. p K a of HF is 3.14. A) 3.14 B) 10.80 C) 5.83 D) 7.35 E) 12.00 2. What is the molarity of a sodium hydroxide solution if 25.0 mL of this solution reacts exactly with 22.30 mL of 0.253 M sulfuric acid? A) 0.113 M B) 0.226 M C) 0.284 M D) 0.451 M E) 0.567 M 3. What quantity of NaOH(s) must be added to 1.00 L of 0.200 M HCl to achieve a pH of 12.00? (Assume no volume change.) A) 0.200 mole B) 0.420 mole C) 0.210 mole D) 0.010 mole E) none of these 4. For ammonia, K b is 1.8 x 10 -5 . To make a buffered solution with pH 10.0, the ratio of NH 4 Cl to NH 3 must be A) 1.8 : 1 B) 1 : 1.8 C) 0.18 : 1 D) 1 : 0.18 E) none of these
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Practice Exam 3 v2 (Zumdahl Chapters 8, 9, 10) Page 2 5. Consider a solution of 2.0 M HCN and 1.0 M NaCN (K a for HCN = 6.2 x 10 -10 ). Which of the following statements is true? A) The solution is not a buffer because [HCN] is not equal to [CN - ]. B) The pH will be below 7.00 because the concentration of the acid is greater than that of the base. C) [OH - ] > [H + ] D) The buffer will be more resistant to pH changes from addition of strong acid than of strong base. E) All of the above are false. 6. An indicator HIn has a K a = 1 x 10 –8 . At pH = 6.0, what is the ratio HIn/In ? A) 1/1 B) 100/1 C) 1/100 D) 1/1 E) none of these 7. How many moles of Fe(OH) 2 [ K sp = 1.8 x 10 –15 ] will dissolve in one liter of water buffered at pH = 12.00? A)
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Fall 2009 Exam 3 Practice v2 _Zumdahl Chapters 8,9,10_ no answer key

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