|MadSci Network: General Biology|
I found an experiment to perform and it works, but I don't understand why. Mix cornstarch and water, and place it inside a plastic bag, then seal it. Place the sealed bag in a beaker of water plus 15 drops of iodine. After 15min or so, the cornstarch mixture becomes purple, and the water and iodine remain orange/brown. Why does the iodine permeate the plastic bag? I know it has to do with osmosis, but I don't know what chemical properties iodine has that it can permeate the plastic. Thanks for your help. Sincerely, Sharon
Re: Why does iodine pass through a plastic bag?
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