Organic Compounds Lab Report Essay

703 Words3 Pages
Identifying Organic Compounds
Joe Harris 11/12/07
1. Background Organic compounds are, by definition, any chemical compound containing carbon. These compounds include carbohydrates, polysaccharides, lipids, proteins, and nucleic acids. Each one of these compounds has a different purpose. Carbohydrates give energy to cells when consumed. Lipids are basically the fats of a cell. Proteins are the building blocks of muscle in a cell. Nucleic acids are used to transfer genetic information from one cell to the other. The purpose of this lab is to simply determine the absence or presence of the main
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7.When water bath is ready, put each test tube into the water bath. Wait 5 minutes.
8.After 5 minutes, remove test tubes from the water bath set in test tube holder and record results. Also turn off hot plate.
9.Clean both test tubes thoroughly.
10. Repeat steps 2 and 3.
11.Add 10 drops of Lugol's solution to each test tube.
12.Swirl to mix.
13.Record data.
14.Clean both test tubes thoroughly.
15.Repeat steps 2 and 3.
16.Add 10 drops of Biuret solution to each test tube.
17.Swirl to mix.
18.Wait 1-2 minutes.
19.Record data.
3. Data and Results A. Data Tables
Benedict's Test
Test Tube
Original Color
Final Color
Tube Contains
+ or -
A
Light Blue
Orange
Sugar
+
B
Light Blue
Light Blue
Still Unknown
-

Lugol's Test
Test Tube
Original Color
Final Color
Tube Contains
+ or -
A
Clear
Yellow
Still Unknown
-
B
Clear
Dark Purple
Starch
+

Biuret Test
Test Tube
Original Color
Final Color
Tube Contains
+ or -
A
Clear
Light Purple
Protein
+
B
Clear
Clear
Clear
-

4. Conclusion During the Benedict's test, the contents of tube B did not change, indicating the absence of sugar in that particular substance. However, the contents of tube A did change orange indicating the presence of sugar in that substance. During the Lugol's test, the content of tube A did not change dark purple indicating the absence of starch in that substance However, the content of tube B changed to dark purple
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