1. Sublimation:
* Understanding Sublimation: Iodine is a solid that can directly transition from a solid to a gas (sublimation) when heated. Potassium chloride, on the other hand, has a much higher melting point and won't sublimate under these conditions.
* Procedure:
* Heat the mixture: Gently heat the mixture in a beaker or flask. A fume hood is recommended as iodine vapor can be irritating.
* Collect the iodine: Place a cold surface (like a petri dish filled with ice) above the mixture. As the iodine sublimates, it will condense on the cold surface, forming solid iodine crystals.
* Remove the iodine: Carefully collect the iodine crystals.
2. Filtration:
* Understanding Filtration: After the sublimation process, you'll be left with solid potassium chloride in the beaker. You can use filtration to separate any remaining solid iodine particles from the potassium chloride.
* Procedure:
* Prepare the filter: Use a filter paper in a funnel and place it over a clean beaker.
* Dissolve the potassium chloride: Add water to the beaker containing the potassium chloride. The KCl will dissolve, forming a solution.
* Filter the solution: Pour the solution through the filter paper. The solid iodine particles will be trapped on the filter paper.
* Collect the potassium chloride: You can obtain the potassium chloride by evaporating the water from the filtrate.
Important Considerations:
* Safety: Iodine vapor is irritating, so it's crucial to perform the sublimation step in a fume hood.
* Cleanliness: Use clean beakers and glassware to prevent contamination.
* Heat control: Use gentle heat to avoid decomposition of the iodine or the potassium chloride.
* Complete separation: Some iodine particles might remain in the potassium chloride after sublimation. Repeating the sublimation step might be necessary for complete separation.
Note: This method assumes the mixture is a dry powder. If the mixture is dissolved in a solvent, a different separation method might be needed.
