Procedure 1. Obtain three clean test tubes and label them as you did in Activity I for the starch test. 2. Add 10 drops

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Procedure 1 Obtain Three Clean Test Tubes And Label Them As You Did In Activity I For The Starch Test 2 Add 10 Drops 1 (51.52 KiB) Viewed 11 times

Procedure 1. Obtain three clean test tubes and label them as you did in Activity I for the starch test. 2. Add 10 drops of Benedict's solution to each test tube. Record the color of the Benedict's reagent in the table below ("Reagent Color"). 3. Add 10 drops of distilled water to the tube marked "DI". 4. Add 10 drops of 1% glucose (sugar) to the tube marked "sugar. 5. Add 10 drops of 1% amylose (starch) to the tube marked "starch". 6. Gently shake each tube. 7. Place all three test tubes in a beaker of boiling water on the hot plate at the rear of the classroom. Make a note of the beaker where you placed your test tubes, as the whole class will have tubes in beakers. 8. Allow the tubes to heat for 10 minutes (or less; watch for a color change). 9. Use a test tube holder to carefully remove the tubes. Carry your test tube rack with you to retrieve your test tubes from the hot water bath. Do NOT walk around the room carrying test tubes with the test tube holder. 10. Record the color of the sample in the table below ("Color after addition of sample"). Make note of any color changes that occurred. 11. In the "Conclusion" column, place a "+" if the tube is positive for sugar or a "_" if the tube is negative for sugar. 12. Use soap, water, and a test tube brush to clean the test tubes and place them in the rack to dry. Be certain they are not touching one another when you place them in the rack. Reagent Color Sample Water 1% Glucose (sugar) 1% Amylose (starch) Color Color Change (after addition of sample) (yes or no?) What does the Benedict's reagent test for? What color indicates a positive reaction? Conclusion