EXPERIMENT WITH IODINE - Iodine Chemical Reaction

Summary

This video showcases four fun and educational tricks using iodine to demonstrate various chemical reactions. First, it explores how iodine's color can be removed and restored with hydrogen peroxide and acetic acid. Next, the script dives into the starch reaction, where iodine turns bread black when mixed with water. Vitamin C levels are tested as iodine returns to clear when combined with ascorbic acid. Finally, an iodine clock reaction is demonstrated with a complex mixture of ingredients, showcasing the intriguing effects of iodine in chemistry experiments.

Takeaways

• 😀 Trick 1: Removing and restoring color using iodine and hydrogen peroxide; after 15 minutes, iodine color is removed and restored with acetic acid.
• 😀 Trick 2: The carbohydrate reaction—iodine reacts with starch in bread, turning the color black as it dissolves the starch.
• 😀 Trick 3: Testing vitamin C levels—iodine reacts with ascorbic acid (vitamin C), making the solution clear again, showing its antioxidant properties.
• 😀 Trick 4: Iodine clock reaction—mixing iodine, ascorbic acid, and other chemicals creates a visible color change reaction.
• 😀 Water is a common base ingredient across all tricks, helping to dissolve and mix the other substances.
• 😀 Hydrogen peroxide is used in Trick 1 to remove iodine’s color, demonstrating a chemical change.
• 😀 Acetic acid is essential in Trick 1 to restore the iodine color after it's removed.
• 😀 Iodine reacts with starch (from bread) to show a clear color change, revealing the presence of carbohydrates.
• 😀 The vitamin C test demonstrates the power of antioxidants by turning iodine back to a clear state.
• 😀 The iodine clock reaction involves mixing iodine, water, boiled water, corn starch, and acetic acid to create a delayed color change.
• 😀 The iodine clock reaction highlights how different substances can be combined to create visible, timed chemical reactions.

Q & A

What is the purpose of Trick 1 in the experiment?

Trick 1 demonstrates how iodine can be used to remove color from a substance, which is then restored by the addition of acetic acid. It shows the reversible nature of iodine's reaction with certain compounds.

What happens when iodine is added to a substance in Trick 1?

When iodine is added to the substance, it initially removes the color. After 15 minutes, acetic acid is added to restore the color.

What is the role of hydrogen peroxide in Trick 1?

Hydrogen peroxide helps in the decolorization process by reacting with iodine, contributing to the color removal when it is initially added.

Why is acetic acid used in Trick 1?

Acetic acid is used to restore the color that was removed by iodine. It helps reverse the chemical reaction, allowing the original color to return.

What does Trick 2 focus on testing?

Trick 2 focuses on testing the presence of starch in bread. Iodine is used to react with the dissolved starch from the bread, causing a color change to black.

Why does iodine turn black when it reacts with bread in Trick 2?

Iodine turns black when it reacts with starch because starch molecules form a complex with iodine, resulting in a characteristic black color.

What is the significance of Vitamin C in Trick 3?

In Trick 3, Vitamin C (ascorbic acid) is used to test its antioxidant properties. When ascorbic acid is added to iodine, it reduces the iodine, making the solution clear again.

How does ascorbic acid affect iodine in Trick 3?

Ascorbic acid (Vitamin C) reduces iodine back to its colorless form, demonstrating its ability to neutralize the iodine's color, showing its role as an antioxidant.

What is the iodine clock reaction demonstrated in Trick 4?

The iodine clock reaction is a well-known chemical reaction where the solution changes color suddenly after a specific amount of time. In this case, it involves a mixture of iodine, hydrogen peroxide, acetic acid, and starch, where the reaction time is controlled by varying concentrations.

How does adding more water influence the iodine clock reaction in Trick 4?

Adding more water dilutes the solution, affecting the speed at which the iodine clock reaction occurs. This adjustment helps in controlling the reaction time before the color change is visible.

Why is boiled water used in Trick 4?

Boiled water is used in Trick 4 to ensure that the reaction components are fully dissolved and mixed properly, as temperature can influence the rate of chemical reactions.

What is the role of corn starch in the iodine clock reaction?

Corn starch is used as an indicator in the iodine clock reaction. It reacts with iodine, turning the solution black when iodine is present, helping to visually track the progress of the reaction.