Diffusion!

This is a youtube video that show diffusion of iodine through a bag (representative of a cell wall) to create a solution with starch that is the color blue. This can be used as a simple diffusion lesson, a mixtures and solutions lesson, or a lesson showing how starch is an indicator for iodine. The lab is easy enough to do in your classroom, but if time is tight showing the video is interesting too.  Link below:

https://www.youtube.com/watch?v=2Th0PuORsWY

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