1918review - 1918review Student: _ 1. Which of the...

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Page 1 1918review Student: ___________________________________________________________________________ 1. Which of the following pairs has the stronger acid listed first? A. H 2 AsO 3 , H 2 AsO 4 B. HI, HBr C. HClO, HClO 3 D. H 2 S, HCl E. H 2 SO 3 , H 2 SO 4 2. What is the pH of a 0.050 M HBr solution? A. 0.89 B. 1.12 C. 1.30 D. 3.00 E. none of these choices is correct 3. What is the [OH - ] for a solution at 25°C that has [H 3 O + ] = 2.35 × 10 -3 M ? A. 4.26 × 10 -5 M B. 2.35 × 10 -11 M C. 4.26 × 10 -12 M D. 2.35 × 10 -17 M E. none of these choices is correct 4. A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of K a for this acid? A. 7.2 × 10 1 B. 0.16 C. 0.099 D. 0.0014 E. 0.00027
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Page 2 5. Lactic acid has a p K a of 3.08. What is the approximate degree of dissociation of a 0.35 M solution of lactic acid? A. 1.1% B. 2.2% C. 4.8% D. 14% E. none of these choices is correct 6. Arsenic acid, H 3 AsO 4 , is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K 1 = 2.5 × 10 -4 , K 2 = 5.6 × 10 -8 , and K 3 = 3 × 10 -13 . What is the concentration of the HAsO 4 2- in a solution whose initial arsenic acid concentration was 0.35 M ? A. 9.4 × 10 -3 M B. 2.5 × 10 -4 M C. 8.8 × 10 -5 M D. 5.6 × 10 -8 M E. none of these choices is correct 7. What is the value of K b for the cyanide anion, CN - ? K a (HCN) = 6.2 × 10 -10 A. 1.6 × 10 -4 B. 1.6 × 10 -5 C. 3.8 × 10 -4 D. 3.8 × 10 -5 E. 6.2 × 10 4 8. Which, if any, of the following aqueous mixtures would be a buffer system? A. CH 3 COOH, NaH 2 PO 4 B. H 2 CO 3 , HCO 3 - C. H 2 PO 4 - , HCO 3 - D. HSO 4 - , HSO 3 - E. None of these will be a buffer solution.
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Page 3 9. Which one of the following aqueous solutions, when mixed with an equal volume of 0.10 mol L -1 aqueous NH 3 , will produce a buffer solution? A. 0.10 mol L -1 HCl B. 0.20 mol L -1 HCl C. 0.10 mol L -1 CH 3 COOH D. 0.050 mol L -1 NaOH E. 0.20 mol L -1 NH 4 Cl 10. Which of the following has the highest buffer capacity? A. 0.10 M H 2 PO 4 - /0.10 M HPO 4 2- B. 0.50 M H 2 PO 4 - /0.10 M HPO 4 2- C. 0.10 M H 2 PO 4 - /0.50 M HPO 4 2- D. 0.50 M H 2 PO 4 - /0.50 M HPO 4 2- E. They all have the same buffer capacity. 11. An acetate buffer has a pH of 4.40. Which of the following changes will cause the pH to decrease? A. dissolving a small amount of solid sodium acetate B. adding a small amount of dilute hydrochloric acid C. adding a small amount of dilute sodium hydroxide D. dissolving a small amount of solid sodium chloride E. diluting the buffer solution with water 12. Buffer solutions with the component concentrations shown below were prepared. Which of them should have the lowest pH? A. [CH 3 COOH] = 0.25 M , [CH 3 COO - ] = 0.25 M B. [CH
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This note was uploaded on 04/20/2008 for the course CHEM 1300/ taught by Professor Ballester during the Fall '08 term at Nova Southeastern University.

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1918review - 1918review Student: _ 1. Which of the...

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