Experiment to test the presence of starch

Starch is a complex carbohydrate that is commonly found in plants. It is used as a food source for many animals, including humans. To test for the presence of starch, we can perform an iodine test.

Materials required:
- Potato
- Iodine solution
- Water
- Test tubes
- Test tube rack
- Dropper

Procedure:
1. Cut a small piece of potato and place it in a test tube.
2. Add a few drops of water to the test tube to moisten the potato.
3. Add a few drops of iodine solution to the test tube.
4. Observe the color change in the potato.

Observations:
- If the potato turns blue-black, it indicates the presence of starch.
- If the potato remains brown, it indicates the absence of starch.

Explanation:
Iodine solution reacts with starch and forms a blue-black complex. This reaction is used to detect the presence of starch in the given sample.

Conclusion:
Through this experiment, we can conclude whether the given sample contains starch or not. This test is commonly used in the food industry to check for the presence of starch in various food products.