Exercises

313 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
313
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Exercises

  1. 1. CHAPTER 7 : ACID AND BASE<br /><ul><li>EXERCISES
  2. 2. a) Explain what you understand by the term
  3. 3. i-an acid
  4. 4. ii-a base
  5. 5. iii-an alkali
  6. 6. b)What is the effect of an acid and alkali on moist litmus paper?</li></ul> 2 . Identify the correct and incorrect statements below.<br /><ul><li>An alkali is a compound that contains hydroxide ion
  7. 7. An alkali is a compound that produces hydroxide ions in the
  8. 8. presence of water
  9. 9. A base is a compound that produces hydroxide ions in water
  10. 10. A base is a compound that neutralises an acid and produces a salt
  11. 11. and water
  12. 12. Six solutions A,B,C,D,E and F with concentration of 1.0 mol dm-3, have pH values as shown in the table below :
  13. 13. SolutionABCDEFpH values137.0104.01.03.0
  14. 14. Which of the above solutions has
  15. 15. i-the highest concentration of H+ ions
  16. 16. ii- the highest concentration of OH- ions
  17. 17. Which of the above solutions is
  18. 18. i-a strong acid?
  19. 19. ii-a strong alkali?
  20. 20. iii-a weak acid?
  21. 21. iv-a weak alkali?
  22. 22. Which of the above solutions may be
  23. 23. i-ethanoic acid?
  24. 24. ii-hydrochloric acid?
  25. 25. iii-aqueos ammonia?
  26. 26. iv-sodium hydroxide solution?
  27. 27. ANSWERS
  28. 28. a)</li></ul> i- a substance that ionizes in water to produce hydrogen ions, H+<br /> ii- a substance that reacts with an acid to form only salt and water<br /> iii- Soluble bases that produce OH¯ ions in water <br /> b) blue to red colour<br /> 2. i- X<br /> ii- /<br /> iii-X<br /> iv- /<br />3.a) i- E<br /> ii-A<br />b) i-an acid that dissociate (ionize ) completely in water to form hydrogen ion,H+ of high concentration<br /> ii- a base dissociates completely in water to produce hydroxide ions, OH- of high concentration<br /> iii- an acid that dissociate (ionize ) partially in water to produce hydrogen ions,H+ of low concentration. <br />iv- a base dissociates partially to produce hydroxide ions, OH- of low concentration<br /><ul><li>i-F
  29. 29. ii-E
  30. 30. iii-C
  31. 31. iv-A

×