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Chemistry
Fisher Ward
31 March, 17:43
What is the iodine test?
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Gracelyn Knight
31 March, 18:58
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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 color of the aqueous solution remains.
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