92.3k views
2 votes
How can a mixture of iodine crystals and common salt be separated?

A) Sublimation.
B) Filtration.
C) Sieving.
D) Centrifugation.

1 Answer

1 vote

Final answer:

To separate iodine crystals from common salt, sublimation is the suitable method. Iodine sublimes when heated, and the vapor can be deposited as solid crystals on a cold surface, leaving salt behind.

Step-by-step explanation:

To separate a mixture of iodine crystals and common salt, we can use the method of sublimation. This physical process relies on the fact that iodine, when heated, transforms directly from a solid to a gas without passing through the liquid state. The gaseous iodine can then be reverted back to a solid through the process of deposition when it comes in contact with a cold surface. Common salt, in contrast, does not sublime and will remain as a solid residue.

This can be carried out by heating the mixture in a container. As the iodine sublimes, it will form a distinctive purple vapor, indicative of iodine gas. Cooling the iodine vapor by placing a cold surface, like an ice-cold watch glass, above the container, will cause the vapor to deposit as solid iodine crystals on the cold surface, leaving behind the salt.

User Abhishek Batra
by
8.5k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.