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Once you've finished the reaction, you will need to pour the solution into ice water. The original ice bath works well for this purpose. Allow the new solution to sit for 5 to 10 minutes, or until the iodine has settled at the bottom. When the iodine has settled at the bottom, you can pour off the excess liquid. Be careful not to dump the solid iodine out as well. Once the brown liquid has been poured off (or decanted), you will be left with wet iodine. The wet iodine slurry will still contain excess sulfuric acid. To rinse away this acid, pour more water onto the slurry and stir. Allow the slurry to settle, and again pour away the excess liquid. Repeat this at least 3 times. You need to remove the water from the iodine slurry to yield a more pure form of iodine powder. Pour the slurry through a paper filter into a new beaker. The filter will allow the water to pass through, and it will hold back the solid iodine.  The solid on the filter paper is the iodine. The liquid can now be discarded. Using vacuum filtration will dry the iodine even more effectively.
Pour the solution into the ice bath. Decant the remaining liquid. Wash the iodine. Filter the iodine.