Extraction of starch from potato and iodine test for identification of starch extracted from potato

Summary

This video demonstrates the process of extracting starch from potatoes and testing its identification. The procedure involves suspending 1g of starch in 50ml of water, boiling it for 1 minute, and cooling the mixture. A cloudy solution forms, which, when treated with iodine, turns dark blue, confirming the presence of starch. The video also encourages viewers to support the channel by liking, commenting, sharing, and subscribing for more content.

Takeaways

• 😀 The video demonstrates the process of extracting starch from potatoes.
• 😀 The procedure starts by suspending 1 gram of starch in 50 milliliters of water.
• 😀 The starch and water mixture is boiled for 1 minute to dissolve the starch.
• 😀 1 milliliter of the solution is taken and placed in a test tube for further testing.
• 😀 After cooling, the solution forms a cloudy mucilage.
• 😀 Iodine solution is added to the cooled starch solution to test for the presence of starch.
• 😀 The starch reacts with iodine, turning the solution dark blue.
• 😀 The dark blue color disappears when the solution is heated.
• 😀 The reaction between iodine and starch is a classic test for starch identification.
• 😀 The video encourages viewers to like, share, comment, and subscribe to the channel.
• 😀 The video aims to demonstrate a simple yet informative experiment on starch extraction and identification.

Q & A

What is the main topic of this video?

The video demonstrates the process of extracting starch from potatoes and conducting a test to identify the starch.

What is the first step in the procedure?

The first step is to dissolve 1 gram of starch in 50 milliliters of water and bring it to a boil for 1 minute.

How much starch is used in the experiment?

1 gram of starch is used in the experiment.

What should happen when the starch solution is cooled?

Once cooled, the starch solution will form a cloudy mixture, indicating the presence of starch.

Why is iodine added to the starch solution?

Iodine is added to the starch solution to test for the presence of starch, as iodine turns starch a dark blue color.

What happens when iodine is added to the starch solution?

When iodine is added to the cooled starch solution, it turns dark blue, which is a positive indicator of the presence of starch.

What does the disappearance of the blue color signify?

The disappearance of the blue color indicates that the starch may have been broken down or affected by heat, as the color fades upon heating.

How much iodine should be added to the starch solution?

1 to 2 drops of iodine solution should be added to the starch solution.

What happens to the starch solution when it is heated?

Upon heating, the dark blue color from the iodine disappears, which is a characteristic behavior when starch is exposed to heat.

What is the purpose of the video?

The purpose of the video is to show how to extract starch from potatoes and perform a test to identify it using iodine, providing a simple experiment for educational purposes.