- In this lab, you will test for the presence of starch in different materials.
MATERIALS NEEDED:
Wax paper
Eyedropper
Tincture of Iodine
Testing Samples:
- notebook paper
- cheese
- bread
- cracker
- sugar
- apple slice
PROCEDURE:
Place the testing samples on the wax paper.
Place one drop of iodine on each of the testing samples.RESULTS:
- The paper, bread, and cracker turn a dark blue-purple. The other samples are just stained by the brown iodine solution.
- Starch combines with iodine to form a blue-purple compound. Only the samples containing starch turn dark when the iodine is added.
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- notebook paper
TESTING FOR STARCH
INTRODUCTION: