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Iodine Crystals
by Dr. Mabel Rodrigues
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Ok, lets see an easy experiment supposing you want
to prepare the Iodine first. You will need:
- Bunsen burner and asbestos square (or a hot plate)
- Tripod and tin lid
- Beaker, 250 ml
- Separating funnel 100ml
- Evaporating dish
- Hydrogen peroxide 20 volume
- Tetrachloromethane or dichloromethane
- Distilled water
- 1M solution of Sulphuric acid
- Supply of ribbon seaweed(Laminaria) - that you can
obtain a a biological supply store or from the sea shore
Procedure
(You must work at a fume cupboard)
- Collect and dry about a dozen 50cm lenghts of the
seaweed and heat them strongly on a tin recipient
until they are reduced to ash; probably it will
reduce a quite small quantity, about a spoonful.
- Add to the ash 20 ml of distilled water
in a beaker, and heat the suspension until it boils.
- Filter the suspension
- Acidify the filtered with Sulphuric acid solution
- Add then the hydrogen peroxide solution.
You will observe the formation of a brown color due
the iodine liberation from the iodine ions present.
- Transfer the mixture to a separating funnel
- Extract the Iodine with tetrachloro methane or other
solvent. The result is an organic solution of iodine.
- In order to obtain crystals , the solvent may be
allowed to evaporate at room temperature, by
placing it in an evaporating dish in a fume cupboard.
It will result crystals of iodine or rather gray-black brilliant flakes.
Hope that satisfies you. If you need a more sofisticated
method, with a purifying step, just ask again.
Mabel (Dr. Mabel Rodrigues)
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