Why does iodine change color in starch?
Understand the Problem
The question is asking about the chemical interaction between iodine and starch, specifically why iodine changes color when it comes into contact with starch. This typically involves a complexation reaction where iodine binds to the amylose component of starch, resulting in a color change, usually to a blue or black color.
Answer
The formation of a triiodide-amylose complex
The final answer is the formation of a triiodide-amylose complex.
Answer for screen readers
The final answer is the formation of a triiodide-amylose complex.
More Information
The amylose in starch has a helical structure that allows triiodide ions (formed by dissolving iodine with potassium iodide) to fit inside it and form the blue-black color complex.
Sources
- Why Does Iodine Turn Starch Blue? - ChemistryViews - chemistryviews.org
- Starch and Iodine - Chemistry LibreTexts - chem.libretexts.org
- Why does the color of iodine solution turn blue when starch is added to it - quora.com
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