The reagent used to test for presence of starch is Iodine. Starch turns 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.Click to see full answer. Just so, how do you test for starch?A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test.Similarly, what color indicates a positive starch test? blue-black Subsequently, one may also ask, what reagent is used to test for sugar? Benedict’s reagentWhat will happen when you add a drop of iodine to starch?When drops of iodine solution are added to starch, we observe that the color of starch changes to Blue-Black. When a few drops of iodine are added to the food containing starch, it turns blue-black in colour showing the presence of starch.
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