1. If the [OH ] = 1 10 4 at 298 K for a given solution, the [H + ] of the solution is equal to 1) 1 10 14 3) 1 10 6 2) 1 10 10 4) 1 10 4 2. Based on Reference Table V, which is the strongest base? 1) NO 3 2) I 3) HSO 4 4) NH 2 3. An acid has ionization constant (K a ) of 1.0 10 8. This value indicates that the acid is 1) weak 3) extremely soluble 2) strong 4) slightly soluble 4. What is the ph of a solution with a hydronium ion concentration of 0.01 mole per liter? 1) 1 3) 10 2) 2 4) 14 5. Which solution is the best conductor of electricity? 1) 0.1 M HCl(aq) 2) 0.1 M CH 3 OH(aq) 3) 0.1 M NH 3 (aq) 4) 0.1 M CH 3 COOH(aq) 6. Given the ionization constant equation: K w = [H + ][OH ] = 1.0 10 14 12. Which substance, if added to a saturated solution of NH 4 OH, would cause the ph of the solution to increase? 1) HCl 2) NH 4 Cl 3) LiOH 4) CH 3 OH 13. Based on Reference Table V, which acid is a strong electrolyte? 1) HNO 3 2) HNO 2 3) HF 4) H 2 S 14. Which of the following acids ionizes to the least extent at 298 K? 1) HF 2) HNO 2 3) H 2 S 4) H 2 O 15. Given the reaction: H 3 PO 4 (aq) H + (aq) + H 2 PO 4 (aq) The ionization constant K a is equal to 1) 3) 2) 4) For water at 25 C, which statement is true? 1) [H + ] = [OH ] 3) [H + ] = 1.0 10 14 M 2) [H + ] > [OH ] 4) [OH ] = 1.0 10 14 M 7. According to Reference Table V, which of the following 1.0 M acid solutions has the greatest [H 3 O + ] at 1 atmosphere and 298 K? 1) HNO 3 2) HF 3) H 3 PO 4 4) HNO 2 8. If the [OH ] equals 1 10 10 at 298 K for a given solution, the [H + ] of the solution equals 1) 1 10-4 3) 1 10 10 2) 1 10 7 4) 1 10 14 9. As an acidic solution is added to a basic solution, the ph of the basic solution 1) decreases 3) remains the same 2) increases 10. What is the H 3 O + ion concentration of a solution that has an OH ion concentration of 1.0 10 3 M? 1) 1.0 10 3 M 3) 1.0 10 11 M 2) 1.0 10 7 M 4) 1.0 10 14 M 11. Based on Reference Table V, which compound is the weakest electrolyte? 1) HI 3) HCl 2) HF 4) HBr 16. What is the H 3 O + concentration of a solution that has an OH concentration of 1 10 3 M? 1) 1 10 3 M 3) 1 10 11 M 2) 1 10 7 M 4) 1 10 14 M 17. What is the H 3 O + ion concentration of a solution whose OH ion concentration is 1 10 3 M? 1) 1 10 4 M 3) 1 10 11 M 2) 1 10 7 M 4) 1 10 14 M 18. When the ph of a solution changes from a ph of 5 to a ph of 3, the hydronium ion concentration is 1) 0.01 of the original content 2) 0.1 of the original content 3) 10 times the original content 4) 100 times the original content 19. Which statement correctly describes a solution with a ph of 9? 1) It has a higher concentration of H 3 O + than OH and causes litmus to turn blue. 2) It has a higher concentration of OIF than H 3 O + and causes litmus to turn blue. 3) It has a higher concentration of H 3 O + than OH and causes methyl orange to turn yellow. 4) It has a higher concentration of OH than H 3 O + and causes methyl orange to turn red.
20. What is the hydroxide ion concentration of a solution with a ph of 4? 1) 1 10 4 3) 1 10 10 2) 1 10 7 4) 1 10 14 21. What is the H + ion concentration of an aqueous solution that has a ph of 11? 1) 1.0 10 11 mol/l 3) 3.0 10 1 mol/l 2) 1.0 10 3 mol/l 4) 11 10 1 mol/l 22. What is the ph of a 0.00001 molar HCl solution? 1) 1 3) 5 2) 9 4) 4 23. Based on Reference Table V, which of the following compounds would ionize most completely? 1) H 2 O 2) H 2 S 3) HCl 4) HF 24. Which relationship is present in a solution that has a ph of 7? 1) [H + ] = [OH ] 3) [H + ] < [OH ] 2) [H + ] > [OH ] 4) [H + ] + [OH ] = 7 25. Which concentration indicates a basic solution at 298 K? 1) [OH ] > 1.0 10 7 2) [OH ] = 1.0 10 7 3) [H 3 O + ] > 1.0 10 7 4) [H 3 O + ] = 1.0 10 7 26. When the ph of a solution is 8, what is the OH ion concentration in moles per liter? 1) 1 10 6 3) 1 10 8 2) 1 10 7 4) 1 10 14 27. What is the ph of a 0.01 M solution of HNO 3? 1) 1 3) 13 2) 2 4) 14 28. The K w value for a sample of water at 1 atm and 298 K will be most likely to change when there is an increase in the 1) concentration of H + ions 2) concentration of OH ions 3) pressure 4) temperature 29. If a given solution at 298 K contains [H + ] = 1.0 10 9, what is the [OH ]? 1) 1.0 10 1 3) 1.0 10 9 2) 1.0 10 5 4) 1.0 10 14 30. If a solution has a hydronium ion concentration of 1 10 9 M, the solution is 1) basic and has a ph of 9 3) acidic and has a ph of 9 2) basic and has a ph of 5 4) acidic and has a ph of 5 31. An aqueous solution that has a hydrogen ion concentration of 1.0 10 8 mole per liter has a ph of 1) 6, which is basic 3) 8, which is basic 2) 6, which is acidic 4) 8, which is acidic 32. According to Reference Table V, which of the following is the strongest acid? 1) H 2 O 2) NH 3 3) HF 4) HNO 2 33. Given the following solutions: Solution A: ph of 10 Solution B: ph of 7 Solution C: ph of 5 Which list has the solutions placed in order of increasing H + concentration? 1) A, B, C 3) C, A, B 2) B, A, C 4) C, B, A 34. Which equation correctly represents the K w for water? 1) K w = [H + ] ^ [OH ] 2) K w = [H + ][OH ] 3) K w = [OH ] ^ [H + ] 4) K w = [H + ] [OH ] 35. Which of the following is the weakest acid? 1) H 2 SO 4 2) HNO 3 3) HF 4) HI 36. At 1 atm and 298 K, which of the K a values listed below represents the strongest acid? 1) 1.1 10 7 3) 5.6 10 11 2) 1.8 10 5 4) 4.6 10 4 37. Which of the following K a values for a 0.1 M acid would have the smallest H 3 O + ion concentration? 1) K a = 5.8 10 2 2) K a = 4.0 10 4 3) K a = 2.1 10 6 4) K a = 6.0 10 10 38. What is the ph of an aqueous solution of C 6 H 12 O 6? 1) 1 3) 11 2) 7 4) 14 39. As 0.1 M HCl is added to 0.1 M KOH, the ph of the basic solution 1) decreases and basicity decreases 2) increases and basicity decreases 3) decreases and basicity increases 4) increases and basicity increases 40. The ionization constants (K a 's) of four acids are shown below. Which K a represents the weakest of these acids? 1) K a = 1.0 10 5 2) K a = 1.0 10 4 3) K a = 7.1 10 3 4) K a = 1.7 10 2 41. What is the ionization constant (K a ) of acetic acid at 298 K? 1) 6.0 10 23 3) 2.2 10 7 2) 1.0 10 14 4) 1.8 10 5
42. The ph of a 0.1 M solution is 11. What is the concentration of H 3 O + ions, in moles per liter? 1) 1 10 1 3) 1 10 11 2) 1 10 3 4) 1 10 13 43. Which of the following aqueous solutions is the poorest conductor of electricity? [Refer to Reference Table V] 1) 0.1 M H 2 S 2) 0.1 M HF 3) 0.1 M HNO 2 4) 0.1 M HNO 3 44. What is the ionization constant for water at 298 K? 1) 1.0 10 14 3) 1.0 10 7 2) 1.0 10 7 4) 1.0 10 14 45. The [OH ] of a solution is 1 10 6. At 298 K and 1 atm, the product [H 3 O + ][OH ] is 1) 1 10 2 3) 1 10 8 2) 1 10 6 4) 1 10 14 46. Based on Reference Table V, which of the following 0.1 M solutions is the best conductor of electricity? 1) HNO 3 2) HNO 2 3) NH 3 4) CH 3 COOH 47. The ionization constant of a weak acid is 1.8 10 5. A reasonable ph for a 0.1 M solution of this acid would be 1) 1 3) 3 2) 9 4) 14 48. What is the ph of a 0.10 M solution of NaOH? 1) 1 3) 13 2) 2 4) 14 49. As the H 3 O + ion concentration of a solution increases and the OH concentration decreases, the ph of the solution 1) decreases 3) remains the same 2) increases 50. What is the OH ion concentration, in moles per liter, of a solution with a ph of 7? 1) 7 3) 1 10 7 2) 14 4) 1 10 14
Reference Tables
Reference Tables
Answer Key 1. 2 2. 4 3. 1 4. 2 5. 1 6. 1 7. 1 8. 1 9. 1 10. 3 11. 2 12. 3 13. 1 14. 4 15. 1 16. 3 17. 3 18. 4 19. 2 20. 3 21. 1 30. 1 31. 3 32. 4 33. 1 34. 2 35. 3 36. 4 37. 4 38. 2 39. 1 40. 1 41. 4 42. 3 43. 1 44. 1 45. 4 46. 1 47. 3 48. 3 49. 1 50. 3 22. 3 23. 3 24. 1 25. 1 26. 1 27. 2 28. 4 29. 2