Experiment No. 17
Question: How can you discover if food contains starch?
Experiments: To test for starch.
You will need:
three petri dishes.
1. Place a piece of celery, potato and
bread in three different petri dishes.
2. Place the iodine in the pipette.
3. Add a few drops of iodine solution directly to the piece of potato, celery and bread.
4. Observe and record any changes.
Dish 1: Potato
Dish 2: Celery
Dish 3: Bread
|Observations:||The iodine turned from a red/yellow colour to a blue-black colour.||The iodine turned from a red/yellow colour in certain places to a blue-black colour, where starch is stored.||The iodine turned from a red/yellow colour to a blue-black colour.|
1. If starch is present the iodine turns blue-black.
2. If starch is absent the solution stays a red/yellow colour.
3. The starch showed up in the celery where it is stored.
Sixth Class Experiments