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entropy51
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[*] posted on 30-12-2010 at 06:33


Quote: Originally posted by bigad  
why does kings chemistry survival guide preperation 1 for I2 crystals not use an acid
Because it was "written" by Jared Ledgard and any resemblance to chemistry is purely accidental.
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nitric
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[*] posted on 30-12-2010 at 20:40


Another procedure, much more unpleasant but has worked in the past for me is bubbling chlorine gas through the tincture, and that oxidises the KI into I and KCl and also helps precipitate the I2 already dissolved.
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tnphysics
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[*] posted on 30-12-2010 at 22:52


What about boiling off the liquid and reacting the ppt. with conc. H2SO4 (or dilute acid + oxidizer)?



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[*] posted on 31-12-2010 at 12:21


Quote: Originally posted by tnphysics  
What about boiling off the liquid and reacting the ppt. with conc. H2SO4 (or dilute acid + oxidizer)?


I think that would work, but would be harder to work with, it would be preferable just to remove the ethanol then add sulfuric acid to the conc KI + I2 solution with H2O2 or some other oxidizing agent
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