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Answer:
Why Does Iodine Turn Starch Blue?
Author: Catharina Goedecke
Published Date: 06 December 2016
Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Why Does Iodine Turn Starch Blue?
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Iodine Test
Using iodine to test for the presence of starch is a common experiment. A solution of iodine (I2) 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. But how does this color change work?
Starch is a carbohydrate found in plants. It consists of two different types of polysaccharides that are made up of glucose units which are connected in two different ways. One is the linear amylose and the other is the branched amylopectin (pictured below).