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The Home Scientist
May 22, 2013, 3:50:44 PM5/22/13
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Hi, Rachel
The top layer is called the "organic" layer because its made up of an organic solvent (lighter fluid) rather than water.
The iodine contained in the organic layer will form a very thin film, which may not be clearly visible to the naked eye. Also, iodine itself is quite volatile, so it will vaporize relatively quickly, particularly in a warm environment, leaving nothing but the glass. The iodine should be detectable by sniffing carefully. It has a chlorine-like odor. One quick test you can do for the presence of iodine is to put a few drops of starch solution in the dish. (You can even use water that you've cooked potatoes, rice, pasta, or another starchy food in.) The colorless starch solution will turn blue to blue-black if there's even the tiniest amount of iodine present.
On Wednesday, May 22, 2013 3:17:52 PM UTC-4, Rachel Herold wrote:
The top layer is called the "organic" layer because its made up of an organic solvent (lighter fluid) rather than water.
The iodine contained in the organic layer will form a very thin film, which may not be clearly visible to the naked eye. Also, iodine itself is quite volatile, so it will vaporize relatively quickly, particularly in a warm environment, leaving nothing but the glass. The iodine should be detectable by sniffing carefully. It has a chlorine-like odor. One quick test you can do for the presence of iodine is to put a few drops of starch solution in the dish. (You can even use water that you've cooked potatoes, rice, pasta, or another starchy food in.) The colorless starch solution will turn blue to blue-black if there's even the tiniest amount of iodine present.
On Wednesday, May 22, 2013 3:17:52 PM UTC-4, Rachel Herold wrote:
Today I did lab 6.4 and I have some questions.Why is the top layer called the "organic" layer?Once the lighter fluid evaporated I didn't see any residue on the petri dish.Shouldn't there have been some sort of solid particles left after evaporation? The iodine solid that was separated from the water?
Rachel Herold
May 22, 2013, 4:48:16 PM5/22/13
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Thank you!
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