* Sublimation: Ammonium chloride is a solid that readily sublimates (changes directly from solid to gas) when heated. Sand, on the other hand, does not sublimate under normal conditions.
* Procedure:
1. Heat the mixture gently in a suitable container (like a beaker).
2. The ammonium chloride will sublimate, leaving behind the sand.
3. The ammonium chloride vapor can be collected by cooling it on a cold surface, where it will solidify again.
Why other methods are not suitable:
* Filtration: While sand is insoluble, ammonium chloride is also soluble in water, making filtration ineffective.
* Decantation: This technique relies on density difference, but the density difference between sand and ammonium chloride might not be sufficient for efficient separation.
* Evaporation: This method would work, but it's less efficient than sublimation. Ammonium chloride would decompose at high temperatures, potentially making the separation process more complex.
Sublimation is the most efficient and straightforward method to separate sand from ammonium chloride.
