Procedure:
1. Heat the mixture: Gently heat the mixture of lead chloride and silver chloride in water.
2. Lead chloride dissolves: Lead chloride is soluble in hot water. As the water heats up, the lead chloride will dissolve.
3. Silver chloride remains undissolved: Silver chloride is insoluble in hot water, so it will remain as a solid precipitate.
4. Decant the solution: Carefully pour the hot water containing the dissolved lead chloride into a separate container, leaving the solid silver chloride behind.
5. Cool the solution: Allow the solution containing the lead chloride to cool. As it cools, the lead chloride will precipitate out of solution.
6. Filter and dry: Filter the solution to collect the precipitated lead chloride. Wash the collected lead chloride with cold water to remove any residual impurities. Finally, dry the lead chloride.
Explanation:
The difference in solubility of lead chloride and silver chloride in hot water is the key to this separation technique. Lead chloride is moderately soluble in hot water, while silver chloride is practically insoluble.
* Lead chloride: When heated, the lead chloride dissolves in the water. When the solution cools, the solubility of lead chloride decreases, causing it to precipitate out.
* Silver chloride: It remains undissolved throughout the process, allowing for easy separation by decantation.
Safety Precautions:
* Wear appropriate personal protective equipment (PPE) such as gloves and safety goggles.
* Work in a well-ventilated area.
* Lead chloride is toxic, so handle it with care and dispose of it properly.
Note: This method is effective for separating lead chloride and silver chloride from a mixture. However, if other salts are present, further purification steps may be necessary.
