What occurs when iodine solution is added to amylose?
Understand the Problem
The question is asking about the chemical reaction or color change that occurs when iodine solution is added to amylose, which is a polysaccharide. The expected outcome is typically a color change, and the options provided give different possible colors that could result from the reaction.
Answer
When iodine solution is added to amylose, the color turns dark blue.
When iodine solution is added to amylose, the solution turns dark blue due to the formation of a charge transfer complex. Iodine molecules slip inside the helical structure of amylose, causing this color change.
Answer for screen readers
When iodine solution is added to amylose, the solution turns dark blue due to the formation of a charge transfer complex. Iodine molecules slip inside the helical structure of amylose, causing this color change.
More Information
The blue color occurs because iodine fits inside the helical structure of amylose. This interaction creates a charge transfer complex that absorbs different wavelengths of light, resulting in the intense blue coloration.
Tips
A common mistake is thinking the reaction forms a new compound; rather, it's due to iodine fitting within amylose.
Sources
- Starch and Iodine - Chemistry LibreTexts - chem.libretexts.org
- Why Does Iodine Turn Starch Blue? - ChemistryViews - chemistryviews.org
- Effect of iodine on starch - MEL Science - melscience.com
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