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chem.libretexts.org/.../Carbohydrates/Case_Studies/Starch_and_Iodine

Starch amylopectin does not give the color, nor does cellulose, nor do disaccharides such as sucrose in sugar. Iodine Test: When following the changes in some inorganic oxidation reduction reactions, iodine may be used as an indicator to follow the changes of iodide ion and iodine element. Soluble starch solution is added.

www.chemistryviews.org/details/education/10128441/Why_Does_Iodine_Turn_Starch...

Iodine Test. Using iodine to test for the presence of starch is a common experiment. A solution of iodine (I 2) and potassium iodide (KI) in water has a light orange-brown color.If it is added to a sample that contains starch, such as the bread pictured above, the color changes to a deep blue.

melscience.com/US-en/articles/impact-iodine-starch

The result of reaction between starch and iodine solution [Wikimedia] Let’s see how the re­ac­tion of starch and io­dine can be use­ful in dai­ly life. It’s sim­ple: if you have two un­la­beled con­tain­ers of soda and starch at home, and you don’t want to work out which one is which by tast­ing them, add a drop of io­dine. ...

chemistry.elmhurst.edu/vchembook/548starchiodine.html

Starch amylopectin does not give the color, nor does cellulose, nor do disaccharides such as sucrose in sugar. Iodine Test: When following the changes in some inorganic oxidation reduction reactions, iodine may be used as an indicator to follow the changes of iodide ion and iodine element. Soluble starch solution is added.

en.wikipedia.org/wiki/Iodine_test

The iodine test is used to test for the presence of starch.Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex.In the absence of starch, the brown colour of the aqueous solution remains.

allmedtests.com/iodine-test-starch

This is because of the insolubility of the starch-iodine complex which might keep a percentage of the iodine reacting with the titrant. Near the end-point, the starch is included, and the titration procedure is continued considering the measure of thiosulfate included before including the starch. Principle of Iodine test for Starch:

en.wikipedia.org/wiki/Iodine_clock_reaction

The iodine clock reaction is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered by Hans Heinrich Landolt in 1886. The iodine clock reaction exists in several variations, which each involve iodine species (iodide ion, free iodine, or iodate ion) and redox reagents in the presence of starch.Two colourless solutions are mixed and at first ...

www.reference.com/science/iodine-react-starch-66892d08fbad708e

Why Does Iodine React With Starch? When iodine and starch interact, iodine molecules become arranged within the starch molecules in a linear fashion. The visible end result of this arrangement is the appearance of a blue-black coloration.

answersdrive.com/how-does-iodine-react-with-starch-7301496

Starch consists of two types of molecules, amylose - a soluble starch and amylopectin. When starch is mixed with iodine in water, an intensely blue colored starch/iodine complex is formed. Many of the details of the reaction are still unknown. Apparently, the Iodine gets stuck in the coils of beta amylose molecules.

pubs.acs.org/doi/abs/10.1021/j150236a002

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