Suggest Prob 7 - kapur (rk7259) Suggested Problems 7...

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Unformatted text preview: kapur (rk7259) Suggested Problems 7 rowland (53210) 1 This print-out should have 57 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The pH of a 1 10 8 M solution of HNO 3 is 1. 8 2. 6 3. 7 4. 6.96 002 10.0 points What would be the pH of a 10 9 M solution of HCl? 1. 6.998 2. 6.954 3. 6.876 4. 6.921 003 10.0 points Which of the following mixtures can produce a buffer? I) NH 3 + NaOH II) NH 3 + NH 4 Cl III) H + + OH IV) HClO 2 + NaClO 2 V) (CH 3 ) 3 NHCl + (CH 3 ) 3 N 1. I, III, and V only 2. IV only 3. II, IV, and V only 4. II only 5. II, III, and IV only 004 10.0 points Buffers are useful because 1. they can consume a relatively large amount of acid or base without a significant change in pH. 2. they have extremely high melting points. 3. they change the pH of a system signifi- cantly. 4. they are only active inside the human body. 005 10.0 points A buffer is composed of NH 3 and NH 4 Cl. How would this buffer solution control the pH of a solution when a small amount of a strong base is added? 1. The OH reacts with the NH 3 . 2. The OH reacts with the H 2 O. 3. The OH reacts with the Cl . 4. The OH reacts with the NH + 4 . 006 10.0 points A 0.50 M solution of dimethylamine (a weak base with K b = 7 . 4 10 4 ) would be resistant to large changes of pH Z1) when a strong acid is added, but not if a strong base is added. Z2) when a strong base is added, but not if a strong acid is added. Z3) when either a strong acid or a strong base is added. 1. only Z1) is true. 2. only Z3) is true. 3. under neither of the circumstances Z1) and Z2) 4. only Z2) is true. 007 10.0 points kapur (rk7259) Suggested Problems 7 rowland (53210) 2 Which of the following solutions will produce a buffer? I) 20 mL of 0.5 M (CH 3 ) 3 NHCl + 50 mL of 0.1 M (CH 3 ) 3 N II) 20 mL of 0.5 M HNO 2 + 50 mL of 0.1 M NaOH III) 20 mL of 0.5 M HCl + 50 mL of 0.1 M NH 3 IV) 20 mL of 0.5 M HClO 2 + 50 mL of 0.1 M CH 3 COOH V) 20 mL of 0.5 M NH 4 Cl + 50 mL of 0.1 M NaOH 1. I, II, III, and V only 2. II and IV only 3. I, II, IV, and V only 4. II only 5. I, II, and V only 008 10.0 points A 100 mL buffer solution initially has 1.00 M HClO ( K a = 3 . 10 8 ) and 0.75 M NaClO. What is the new pH when this 100 mL of 0.10 M NaOH is added to the initial buffer solution? 1. 10.71 2. 7.50 3. 9.52 4. 11.00 009 10.0 points What is the pH of an aqueous solution that is 0.10 M HCOOH ( K a = 1 . 8 10 4 ) and 0.10 M NaHCO 2 ? 1. 5.74 2. 10.26 3. 3.74 4. 2.38 5. 5.62 010 10.0 points What is the pH of an aqueous solution that is 0.60 M (CH 3 ) 3 N ( K b = 6 . 5 10 5 ) and 0.95 M (CH 3 ) 3 NHCl?...
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Suggest Prob 7 - kapur (rk7259) Suggested Problems 7...

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