Here are the results from the KCl lab. You are to use the to make a solubility graph.: ( temperatures are in degrees Celsius. They are the temperatures when the KCl came OUT of the saturated solution when being cooled.)

Trial

3.4g KCl

4.0g KCl

4.5g KCl

4.8g KCl

1

24

27.6

35.6

78.9

2

23.2

51.2

54.1

81.1

3

18.8

38.4

74.9

71.3

4

20

39.75

74.6

80.1

5

23.6

24.5

77.6

72.3

6

24.1

70

48.3

102.1

7

32.2

33

78

71.2

8

18.9

47.5

72.2

83.3

9

22.1

54.2

60

81.1

10

24.3

38.1

64.2

79.2

11

21.1

73.3

84.2

78.2

12

21.1

34.7

86.9

78.8

13

14.5

39.8

76.2

73.8

14

12.5

63.1

86.1

74

AVG

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Directions:

  1. Model your graph after the one we studied on the worksheet, HOWEVER, do not make your y-axis' numbers have such a big range (instead, go from 0 grams to 50 grams)
  2. REMEMBER, we used 10 mL of water, however, solubility graphs are based on 100 M mL of water. Scale up your grams of KCl accordingly.
  3. Calculate the average temperatures in the empty boxes above.
  4. The assessment list for the graph says to have "a line for averaged data and one for non-averaged data" INSTEAD, you should have one line that is a "best fit" line and then make another one that is from the averages. Make them in two different colors and key them.

Oh yea…When answering question, 9 (from the lab) use the "best fit" line to get your answers.