Melting Range Report
Melting Range Report Name: Date: Lab Section:
Selected Known Compounds
Name
Structural Formula
Literature Melting Point
Acetanilide
C8H9NO
114.3°C
Fluorene
C13H10
116.5°C
Experimental Data
Sample Composition
1.
100%
Acetanilide
2.
10%
Acetanilide
3.
25%
Acetanilide
4.
50%
Acetanilide
Fluorene
5.
75%
Acetanilide
6.
90%
Acetanilide
7.
100%
Fluorene
Melting Range
108-116°C
108-112°C
105-112°C
102-109°C
105-112°C
109-115°C
108-114.5°C
Graph of Data
Discussion of Results
The purpose of this experiment was to demonstrate the technique of melting point determination and to utilize both pure and mixed melting points to identify the effect that an impurity may have on the melting range of a given sample. After assembling the melting point apparatus with a Thiele tube oil bath, the approximate melting range of acetanilide was determined to be 108°C - 116°C. This procedure was repeated with a pure sample of fluorene and the melting range was determined to be 108°C – 114.5°C. The two substances in the literature were very close to the melting point range. The melting range of acetonilide mixed with the fluorene was put in ratios of: 10:90, 25:75, 50:50, 75:25, and 90:10. The melting range of acetanilide mixed with the fluorene in that given order was: 108-112°C, 105-112°C, 102-109°C, 105-112°C, and 109-115°C. When the two compounds were mixed with one another, the conclusion is that they each suppressed one another to lower each substance’s melting range just slightly below the literature melting point range.
References
"Sigma-Aldrich: Analytical, Biology, Chemistry & Materials Science Products and Services." Sigma-Aldrich. N.p., n.d. Web. 24 Sept. 2014.
Crouse, David J. Laboratory Exercises For Organic Chemistry 3010-3020, 10th ed. Cookeville: 2013. p. 19-21. Print.
Selected Known Compounds
Name
Structural Formula
Literature Melting Point
Acetanilide
C8H9NO
114.3°C
Fluorene
C13H10
116.5°C
Experimental Data
Sample Composition
1.
100%
Acetanilide
2.
10%
Acetanilide
3.
25%
Acetanilide
4.
50%
Acetanilide
Fluorene
5.
75%
Acetanilide
6.
90%
Acetanilide
7.
100%
Fluorene
Melting Range
108-116°C
108-112°C
105-112°C
102-109°C
105-112°C
109-115°C
108-114.5°C
Graph of Data
Discussion of Results
The purpose of this experiment was to demonstrate the technique of melting point determination and to utilize both pure and mixed melting points to identify the effect that an impurity may have on the melting range of a given sample. After assembling the melting point apparatus with a Thiele tube oil bath, the approximate melting range of acetanilide was determined to be 108°C - 116°C. This procedure was repeated with a pure sample of fluorene and the melting range was determined to be 108°C – 114.5°C. The two substances in the literature were very close to the melting point range. The melting range of acetonilide mixed with the fluorene was put in ratios of: 10:90, 25:75, 50:50, 75:25, and 90:10. The melting range of acetanilide mixed with the fluorene in that given order was: 108-112°C, 105-112°C, 102-109°C, 105-112°C, and 109-115°C. When the two compounds were mixed with one another, the conclusion is that they each suppressed one another to lower each substance’s melting range just slightly below the literature melting point range.
References
"Sigma-Aldrich: Analytical, Biology, Chemistry & Materials Science Products and Services." Sigma-Aldrich. N.p., n.d. Web. 24 Sept. 2014.
Crouse, David J. Laboratory Exercises For Organic Chemistry 3010-3020, 10th ed. Cookeville: 2013. p. 19-21. Print.
References: "Sigma-Aldrich: Analytical, Biology, Chemistry & Materials Science Products and Services." Sigma-Aldrich. N.p., n.d. Web. 24 Sept. 2014. Crouse, David J. Laboratory Exercises For Organic Chemistry 3010-3020, 10th ed. Cookeville: 2013. p. 19-21. Print.