Part 1|Iodine Clock Experiment Using Vitamin C and Starch |Sudden Blue-Black Color Change #iodine

Watch the fascinating iodine clock reaction using Vitamin C, Potassium Iodide (KI), Hydrogen Peroxide (H₂O₂), and Starch.
At first, the solution remains colorless because vitamin C removes the iodine as soon as it forms. When all the vitamin C is consumed, iodine accumulates and reacts with starch, causing a sudden blue-black color change.
Main Reaction Steps
Hydrogen peroxide oxidizes iodide to iodine.
Vitamin C reduces iodine back to iodide.
After vitamin C is exhausted, iodine reacts with starch.
The solution instantly turns blue-black.
Chemicals Used
Potassium Iodide (KI)
Hydrogen Peroxide (H₂O₂)
Vitamin C (Ascorbic Acid)
Starch Solution
Water
Educational Topics
Chemical Kinetics
Oxidation and Reduction
Indicators
Reaction Rates
This experiment is excellent for chemistry students, teachers, and science enthusiasts.
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