Sublimation method is used when one of the substance of the mixture is a sublime substance and the other one not.Due to time the sublime substance will evaporate and the residue is the substance which does not sublime. Hope it will help you!!!!

Introduction:

The sublimation method for separation is commonly used when a mixture contains a solid component that can undergo sublimation. Sublimation is the process by which a solid directly transforms into a gas without passing through the liquid phase. This method takes advantage of the different physical properties of the components in a mixture to separate them.

Principle of Sublimation:

Sublimation occurs when the vapor pressure of a solid exceeds atmospheric pressure at a given temperature. By heating the mixture to a temperature where the solid component sublimes, it can be separated from the other components.

Process of Sublimation:

The process of sublimation involves the following steps:

1. Heating: The mixture is heated to a specific temperature that allows the solid component to sublimate. This temperature is usually higher than the boiling point of the solid but lower than its decomposition temperature.

2. Conversion to Gas: As the solid component is heated, it directly transforms into a gas without passing through the liquid phase. This gas is then collected and separated from the remaining components of the mixture.

3. Cooling and Collection: The gas obtained from sublimation is cooled, causing it to condense back into a solid form. This solid is then collected and separated from any remaining gas or impurities.

Applications of Sublimation Method:

The sublimation method for separation finds applications in various fields, including:

1. Purification of Substances: Sublimation is often used to purify certain substances by removing impurities. For example, iodine can be purified through sublimation, where impurities are left behind as the iodine sublimes.

2. Separation of Components: Sublimation can be used to separate a mixture of solids when one of the components is volatile enough to undergo sublimation. This is particularly useful in cases where traditional separation methods like filtration or distillation are not applicable.

3. Production of Dry Ice: The sublimation of carbon dioxide gas is used to produce dry ice, which is widely utilized in various industries, such as food preservation, transportation, and chemical processes.

Overall, the sublimation method for separation is employed when a solid component in a mixture can undergo sublimation. It allows for the separation and purification of substances based on their different sublimation properties, providing an efficient and effective separation technique in various scientific and industrial applications.