The Boiling Point Experiment

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Hypothesis:
I think that in this experiment the results of the boiling point of each sample is going be slighly different from what I found on Internet. aim:
my aim is to look at what temperature and how long the following alcohol (methanol, I-butanol, Ethanol and Hexane) reach their boiling point and comparing the results that I found on internet and mine. Materials:

Alcohol: Ethanol, I-Butanol, Ethanol and Hexane
Four Test tubes (boiling tube)
Test tubes holder
Data logger
Hot plates
Bunsen burner
Beaker 500 ml
Measuring cylinder

Independent Variable: The alcohol
Controlled variable: Keep the same
Dependent Variable: The temperature

Method:
1)Prepare and clean the materials before beginning the experiment. Take four Boil tube and the data logger.

2)Take the First Test tube for the first sample, put 20 ml of Butanol on the measuring cylinder and after on the test tube to be more precise and prepare the data logger and his thermometer to mesure the temperature for the boiling point. Take the test tube with the test tubes holder for safety and Put on the Bunsen burner and wait until it start to boil and take off the tube.

3) Clean the area for safety and take the second test tube for Ethanol, put 20 ml and prepare the data logger to mesure the temperature for the boiling point. Hit it with the bunsen burner and take off the tube when it start to boil.

4)Clean again and prepare the third tube for the third sample which is hexane, put 20 ml of hexane and put the thermometer of the data logger in the test tube to mesure the temperature of the boiling point, hit it until it boils and take it off.

5)Prepare the fourth sample on the last test tube, put 20 ml of methanol, make sure to wash the test tube before hitting it. Prepare the data logger and put the thermometer inside the test tube and hit it with the bunsen burner until it reach his boiling point and take it off.

6)Repeat trials but in a different way of boiling the alcohol. Put approximatly 400 ml of water in the 500 ml beaker and start hitting the water on a hot plate. Put the test tube with the sample inside the beaker and wait if it start to boil.

Results :
Results from Internet which the links are:

Sample Boiling Point I-Butanol 117 °C
Ethanol78.4 °C
Hexane 68 °C
Methanol64.7 °C

31/03/2009 14:17:02 .
butanol
TimeTemperature
Temp
s°C

026.7829755065
0.526.7829755065
126.7597793016
1.526.7829755065
226.7829755065
2.526.8061721927
326.8061721927
3.526.8061721927
426.8061721927
4.526.8061721927
526.8293693717
5.526.8757652535
626.9453630559
6.526.9917643764
727.1295324009
7.527.3384042615
827.9625144638
8.529.1447846673
930.5185632496
9.531.9224374234
1033.3861125643
10.534.9347896272
1136.4782627336
11.538.1428110841
1239.8619041907
12.541.5903704683
1343.3054116483
13.544.9545809994
1446.5921813137
14.548.2172361743
1549.7404041293
15.551.1898451152
1652.6778598736
16.553.9559891203
1755.2048225496
17.556.5537691279
1857.736190264
18.558.8794801642
1960.0165648934
19.561.1467731512
2062.26931981
20.563.383300496
2164.4500591658
21.565.5838960553
2266.6681993147
22.567.780001005
2369.0588379729
23.570.2909213666
2471.5607363286
24.572.977108807
2574.3938307692
25.575.9205814782
2677.5733584186
26.579.064846835
2780.6205851797
27.582.1867086701
2883.9554832117
28.585.8932166804
2987.7134863279
29.589.7184398517
3091.672282528
30.593.7488158873
3195.863400119
31.597.7129770416
3299.4561984603
32.5100.960317696
33102.303310255
33.5103.344453091
34104.182597432
34.5104.794088573
35105.534708558
35.5105.915096572
36106.299756107
36.5106.558616285
37106.819446963
37.5106.95061058
38107.082278111
38.5106.688783454
39106.171055769
39.5...
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