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2. Place a few drops of iodine solution on each food. 3. Make observations immediately. 4. Wait a few more minutes and note any other changes. Observations Complete the chart below using the food your group has compiled. When drops of iodine solution are applied to a food containing starch, the solution will turn dark blue, purple, or blackish. Data table: Food product Description before testing Description after testing Conclusion: are complex sugars present? 1. 2. 3. 4. 5. 6.
To test an unknown substance for starch, you first need to dissolve 10 grams (0.35 ounces) of potassium iodide and 5 grams (0.18 ounces) of iodine in 100 milliliters (3.4 fluid ounces) of water. Place a few drops of the mixture on any items that you want to test for starch. The solution will change color in the presence of starch. Some items to try are potatoes, meat, rice, flour, wood, and apples or pears. Some contain starch and some do not.