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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. ...

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.

en.wikipedia.org/wiki/Source_of_iodine

The iodide and iodate anions are often used for quantitative volumetric analysis, for example in iodometry and the iodine clock reaction (in which iodine also serves as a test for starch, forming a dark blue complex), and aqueous alkaline iodine solution is used in the iodoform test for methyl ketones.

allmedtests.com/iodine-test-starch

Between iodine titrations, concentrated iodine arrangements must be reacted with some titrant, frequently thiosulfate, to uproot the greater part of the iodine before the starch is included. This is because of the insolubility of the starch-iodine complex which might keep a percentage of the iodine reacting with the titrant.

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.

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.answers.com/Q/What_is_the_product_of_the_reaction_between_starch_and_iodine

The color formed by reaction between starch and iodine is much more intense than the color of iodine itself, so that the end point can be determined more sensitively with than without starch. share:

answers.yahoo.com/question/index?qid=20080821185510AAj0O4a

Iodine solution is used to test for starch. A bluish-black color indicates the presence of iodine in the starch solution. It is thought that the iodine fits inside the coils of amylose. A 0.3% w/w solution is the standard concentration for a dilute starch indicator solution.

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.