Density of ethanol and water mixtures (20°C)
Ethanol
(%)
Density
(g/cm3)
Ethanol
(%)
Density
(g/cm3)
Ethanol
(%)
Density
(g/cm3)
0
0.998
34
0.947
68
0.872
2
0.995
36
0.943
70
0.868
4
0.991
38
0.939
72
0.863
6
0.988
40
0.935
74
0.858
8
0.985
42
0.931
76
0.853
10
0.982
44
0.927
78
0.848
12
0.979
46
0.923
80
0.843
14
0.977
48
0.918
82
0.839
16
0.974
50
0.913
84
0.834
18
0.971
52
0.909
86
0.828
20
0.969
54
0.905
88
0.823
22
0.966
56
0.900
90
0.818
24
0.964
58
0.896
92
0.813
26
0.960
60
0.891
94
0.807
28
0.957
62
0.887
96
0.801
30
0.954
64
0.882
98
0.795
32
0.950
66
0.877
100
0.789
PROCESSING THE DATA
1. After finding the mass of the distillate by subtracting the mass of the graduated cylinder from the mass of the graduated cylinder + distillate, calculate the density of each fraction using the formula: density = mass/volume.
2. Using the density table above, determine the % ethanol corresponding to the density of each fraction. Record these values.
3. Using the values of % ethanol obtained in the previous step, determine the % water for each fraction.
4. What is the primary component of the first fraction you collected? Explain why it is not pure.
5. Did the density of the fractions increase or decrease as the experiment progressed? Explain.
6. What happened to the % of ethanol in the collected fractions as the experiment progressed? What happened to the % of water?
7. What could be done to subsequently increase the purity of the ethanol (reduce the water) in the first fraction? Explain.
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