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Old Oct 10th 2018, 11:41 AM   #1
tylerngo
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Extracting iodine

I did an electrolysis of KI and now I have a solution of KOH and I3- anions. I want to preparate elemental iodine by sublimation. However, when I start heating the solution, it starts to sublimate iodine with water. H2O steam is with the iodine on a flask and then it condenses and take crystallized iodine back down to the solution. How should i extract the iodine without water?

(I purchase all my cemicals and lab equipment from brumer)
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Old Oct 15th 2018, 04:21 AM   #2
Woody
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What is the sublimation temperature for Iodine?
What is the boiling point of Water?

You need to find a point where the sublimation temperature for Iodine is usefully higher than the boiling point of Water.

This could possibly be achieved by changing the pressure,
Check the sublimation temperature verses pressure curves for Iodine against the Boiling temperature verses pressure curves for water.
Hopefully you will find a sweet spot where a sensibly achievable change in pressure will separate the sublimation point relative to the boiling point.
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