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1918review - 1918review Student 1 Which of the following...

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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? 3. What is the [OH - ] for a solution at 25°C that has [H 3 O + ] = 2.35 × 10 -3 M ? 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?
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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 ? 7. What is the value of K b for the cyanide anion, CN - ? K a (HCN) = 6.2 × 10 -10 8. Which, if any, of the following aqueous mixtures would be a buffer system?
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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? 11. An acetate buffer has a pH of 4.40. Which of the following changes will cause the pH to decrease?
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