The reaction between iodine solution and CCl₄ is a simple dissolution process:
I₂ (aq) + CCl₄ (l) → I₂ (CCl₄)
Here's what happens:
* Iodine in water: Iodine in water exists as a dilute solution, with some molecules dissolved and others forming a brown precipitate.
* CCl₄ added: When CCl₄ is added, the iodine molecules are attracted to the nonpolar CCl₄ molecules.
* Dissolution: The iodine molecules move from the water phase into the CCl₄ phase, where they dissolve and form a violet solution.
Key features:
* No chemical reaction: It's a physical process of dissolving iodine in a more suitable solvent.
* Color change: The solution changes from brown in water to violet in CCl₄. This is a good indication that iodine has dissolved in the CCl₄.
This process is often used in laboratory settings for:
* Extraction: To extract iodine from an aqueous solution.
* Qualitative analysis: To identify the presence of iodine, as the violet color in CCl₄ is a characteristic of iodine.
