Uploaded July 2007 | Updated September 2026, 3 weeks ago
A Ziploc bag of Lugol's iodine solution is placed into a beaker of starch water. The video shows 1 frame per 30 seconds for a total of 20 ... all » minutes. The iodine is able to diffuse throught the bag but not the starch nor the water (the bag acts as a selectively permeable membrane). When the iodine comes into contact with the starch water, a dark blue/purple color forms.
A Ziploc bag of Lugol's iodine solution is placed into a beaker of starch water. The video shows 1 frame per 30 seconds for a total of 20 ... all » minutes. The iodine is able to diffuse throught the bag but not the starch nor the water (the bag acts as a selectively permeable membrane). When the iodine comes into contact with the starch water, a dark blue/purple color forms.
