explain the activity which shows sepration of mixture by sublimation in brief
Answers
Answer:
Sublimation is the process of transition of a substance from the solid to the gaseous state without passing through the liquid state. To separate mixtures that contain a sublimate with volatile component from a non-sublimate impurity, the sublimation process is used. Ammonium chloride changes directly from solid to gaseous state on heating. The gaseous form of ammonium chloride can be cooled easily to get a pure solid. Other examples of solids which sublime are camphor, naphthalene, anthracene, iodine, etc.
The remaining components of the mixture are salt and sand. Salt is soluble in water and sand is a non-water soluble substance that can be separated by the process of filtration. The insoluble sand remains in the filter paper while the filtrate contains the dissolved salt.
Evaporation Technique
Evaporation technique is used to separate salt from the filtrate. Common salt does not decompose during evaporation. As the water evaporates, fewer and fewer water molecules are present to keep the salt particles apart. The salt therefore recrystallizes and can be collected.
Learning outcomes
Students understand the terms mixture, sublimation, filteration and evaporation.
Students acquire skilsl to perform the separation of components of a mixture using the following technique:
Sublimation
Filtration
Evaporation
Student analyzes the method suitable to separate ammonium chloride, salt and sand from their mixture.
Students get strong knowledge about different physical states of the components of the given mixture.
Based on the knowledge of solubility, sublimation, etc., the students are able to design suitable separation techniques for the components of the mixture given to them.
Students visualize the way these separations are done in the experiment which will help them to arrange the things properly in the lab.