1. Yesterday’s Homework

2. The concentration of either the H + ion or the OH - ion is given for three aqueous solutions at 298 o K. For each solution, calculate [H + ] or [OH - ]. State whether the solution is acidic, basic, or neutral.

3. Yesterday’s Homework If this wasn’t easy, you’re doing it wrong.

4. Yesterday’s Homework [H + ] = 1.0 x 10 -13 M

5. Yesterday’s Homework [H + ] = 1.0 x 10 -13 M [OH - ] = 1.0 x 10 -1 M

6. Yesterday’s Homework [H + ] = 1.0 x 10 -13 M [OH - ] = 1.0 x 10 -1 M basic

7. Yesterday’s Homework [OH - ] = 1.0 x 10 -7 M

8. Yesterday’s Homework [OH - ] = 1.0 x 10 -7 M [H + ] = 1.0 x 10 -7 M

9. Yesterday’s Homework [OH - ] = 1.0 x 10 -7 M [H + ] = 1.0 x 10 -7 M neutral

10. Yesterday’s Homework [OH - ] = 1.0 x 10 -3 M

11. Yesterday’s Homework [OH - ] = 1.0 x 10 -3 M [H + ] = 1.0 x 10 -11 M

12. Yesterday’s Homework [OH - ] = 1.0 x 10 -3 M [H + ] = 1.0 x 10 -11 M basic

13. Yesterday’s Homework Any questions?

14. Daily Quiz Questions

15. 1. What is true of [H + ] and [OH - ]? a. [H + ] = [OH - ] b. [H + ] x [OH - ] = 1 x 10 -7 c. [H + ] ÷ [OH - ] = 1 x 10 -7 d. [H + ] x [OH - ] = 1 x 10 -14 e. [H + ] ÷ [OH - ] = 1 x 10 -14

16. Daily Quiz Questions 2. In a neutral solution, pH = a. 0 b. 0.5 c. 1 d. 7 e. 14

17. Daily Quiz Questions 3. 1 x 10 -5 = ? a. 5 b. 100,000 c. 0.000,01 d. 0.000,001

18. Daily Quiz Questions 4. Which number is bigger? a. 1 x 10 -2 b. 1 x 10 -6.

19. Daily Quiz Questions 1. What is true of [H + ] and [OH - ]? a. [H + ] = [OH - ] b. [H + ] x [OH - ] = 1 x 10 -7 c. [H + ] ÷ [OH - ] = 1 x 10 -7 d. [H + ] x [OH - ] = 1 x 10 -14 e. [H + ] ÷ [OH - ] = 1 x 10 -14

20. Daily Quiz Questions 1. What is true of [H + ] and [OH - ]? a. [H + ] = [OH - ] b. [H + ] x [OH - ] = 1 x 10 -7 c. [H + ] ÷ [OH - ] = 1 x 10 -7 d. [H + ] x [OH - ] = 1 x 10 -14 e. [H + ] ÷ [OH - ] = 1 x 10 -14

21. Daily Quiz Questions 2. In a neutral solution, pH = a. 0 b. 0.5 c. 1 d. 7 e. 14

22. Daily Quiz Questions 2. In a neutral solution, pH = a. 0 b. 0.5 c. 1 d. 7 e. 14

23. Daily Quiz Questions 3. 1 x 10 -5 = ? a. 5 b. 100,000 c. 0.000,01 d. 0.000,001

24. Daily Quiz Questions 3. 1 x 10 -5 = ? a. 5 b. 100,000 c. 0.000,01 d. 0.000,001

25. Daily Quiz Questions 4. Which number is bigger? a. 1 x 10 -2 b. 1 x 10 -6

26. Daily Quiz Questions 4. Which number is bigger? a. 1 x 10 -2 b. 1 x 10 -6

27. Logarithms

28. The logarithm of a number is the number of times 10 must be multiplied by itself to equal that number.

29. Logarithms 1000 = 10 x 10 x 10 log 1000 = 3

30. Logarithms To find the logarithm of a number, count the zeroes or, if the number is in scientific notation, look at the exponent.

31. Logarithms 1 = 1 x 10 0 10 = 1 x 10 1 100 = 1 x 10 2 0.1 = 1 x 10 -1 0.01 = 1 x 10 -2 log 1 = 0 log 10 = 1 log 100 = 2 log 0.1 = -1 log 0.01 = -2

32. Logarithms

33. You can multiply two numbers by adding their logarithms.

34. Logarithms You can multiply two numbers by adding their logarithms. 100 x 1000 = 100,000

35. Logarithms You can multiply two numbers by adding their logarithms. 100 x 1000 = 100,000 2 + 3 = 5

36. Logarithms You can multiply two numbers by adding their logarithms. 1 x 10 8 = 100,000,000

37. Logarithms You can multiply two numbers by adding their logarithms. 1 x 10 8 = 100,000,000 0 + 8 = 8

38. Logarithms You can multiply two numbers by adding their logarithms. 2 x 10 8 = 200,000,000 ? + 8 = ?

39. Logarithms So what’s the logarithm of 2? You have to look it up. 2 x 10 8 = 200,000,000 ? + 8 = ?

40. Logarithms So what’s the logarithm of 2? You have to look it up. 2 x 10 8 = 200,000,000 0.301 + 8 = 8.301

41. Logarithms What if the number is small instead of big?

42. Logarithms What if the number is small instead of big? 0.0003 = 3 x 10 -4

43. Logarithms What if the number is small instead of big? 0.0003 = 3 x 10 -4 log 0.0003 = log 3 + log 10 -4

44. Logarithms What if the number is small instead of big? 0.0003 = 3 x 10 -4 log 0.0003 = log 3 + log 10 -4 = 0.477 – 4

45. Logarithms What if the number is small instead of big? 0.0003 = 3 x 10 -4 log 0.0003 = log 3 + log 10 -4 = 0.477 – 4 = -3.523

46. Logarithms You can find the logarithm of any number by pressing the “log” key on a calculator…

47. Logarithms You can find the logarithm of any number by pressing the “log” key on a calculator… but

48. Logarithms You can find the logarithm of any number by pressing the “log” key on a calculator… but …if you don’t understand what the calculator is doing, the information is useless to you.

49. Logarithms Try a few!

50. Logarithms log 10 3 =

51. Logarithms log 10 3 = 3

52. Logarithms log 10 8 =

53. Logarithms log 10 8 = 8

54. Logarithms log 10 -10 =

55. Logarithms log 10 -10 = -10

56. Logarithms log 2 =

57. Logarithms log 2 = 0.301

58. Logarithms log 5.8 =

59. Logarithms log 5.8 = 0.763

60. Logarithms log 9.2 =

61. Logarithms log 9.2 = 0.963

62. Logarithms log 4 x 10 12 =

63. Logarithms log 4 x 10 12 = 0.602 + 12

64. Logarithms log 4 x 10 12 = 12.602

65. Logarithms log 8.3 x 10 5 =

66. Logarithms log 8.3 x 10 5 = 0.919 + 5

67. Logarithms log 8.3 x 10 5 = 5.919

68. Logarithms log 7.1 x 10 -3 =

69. Logarithms log 7.1 x 10 -3 = 0.851 - 3

70. Logarithms log 7.1 x 10 -3 = -2.149

71. Logarithms log 4.8 x 10 -11 =

72. Logarithms log 4.8 x 10 -11 = 0.681 - 11

73. Logarithms log 4.8 x 10 -11 = -10.319

74. pH pH = -log [H + ] pOH = -log [OH - ] pH + pOH = 14

75. [H + ] = 0.0035 What is the pH? What is the pOH? Is it acidic or basic?

76. [H + ] = 0.0035

77. 0.0035 = 3.5 x 10 -3

78. [H + ] = 0.0035 0.0035 = 3.5 x 10 -3 log 0.0035 = log 3.5 + log 10 -3

79. [H + ] = 0.0035 0.0035 = 3.5 x 10 -3 log 0.0035 = log 3.5 + log 10 -3 = 0.544 – 3

80. [H + ] = 0.0035 0.0035 = 3.5 x 10 -3 log 0.0035 = log 3.5 + log 10 -3 = 0.544 – 3 = –2.456

81. [H + ] = 0.0035 0.0035 = 3.5 x 10 -3 log 0.0035 = log 3.5 + log 10 -3 = 0.544 – 3 = –2.456 pH = 2.456

82. [H + ] = 0.0035 pH = 2.456 pOH = 14 – 2.456 = 11.544 The solution is acidic.

83. Homework Page 611 # 19 Page 612 # 20