Identifying Organic Compounds Lab

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Identifying Organic Compounds Lab Objective: The objective is to use indicators to test for the presence of organic compounds. Theory: The major types of organic compounds in some common foods are proteins, carbohydrates, lipids, and nucleic acids. In this lab we used indicators to find organic compounds. An indicator is any substance used to assist in the classification of another substance. When an indicators color changes it shows the presence of an organic compound. The purpose of using distilled water as one of the substances is that it is the control so you can see the differences. Also, in the substances distilled water was mixed in with them. The control group in part C is distilled water. The purpose of washing the test tubes thoroughly is so the chemicals don’t cross contaminate and affect the outcome of another section of the lab. Hypothesis: 1. If a substance contains lipids then when rubbed onto a paper bag a transparent or opaque spot will appear. 2. Is a substance contains starches then when iodine solution is added to the substance it will change from yellow-brown to blue-black. 3. If a substance contains sugars then when Benedict solution is added and heat is applied it will turn traffic light colors (red, orange, and yellow). 4. If a substance contains proteins then when Biuret reagent is added the substance will change Easter egg colors (lavender, yellow, and green). Materials: 8 test tubes Test tube rack Test tube holder Glass stirring rod Sharpie marker Hot water bath Iodine solution Brown paper bag Biuret Reagent Benedicts solution 20 ml each: 1. Honey solution 2. Egg white and water solution 3. Gelatin and water solution 4. Melted butter and water solution 5. Apple juice and water solution 6. Corn oil and water solution 7. Distilled water 8. Unknown solution Procedure: Part A: Testing for Lipids 1.

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