What is Sublimation?
Answers
Sublimation consists of the evaporation of a solid from a hot surface and subsequent condensation on another surface at a lower temperature. Depending on the nature of the solid, sublimation can occur at atmospheric pressure or vacuum. It is a very effective microscale solid purification technique and involves minimal loss of substance and removal of solvent residues that may be caught in the solid with better results than in the case of conventional recrystallization. The efficiency of the sublimation process (see Section 4.7.4, p. 108) depends on the vapor pressure of the solid that is to be purified and the impurities that are to be removed. There are many ways to sublimate a solid at the microscale, ranging from the use of equipment specifically designed for this purpose (sublimators) to different adaptations of the material available to perform this operation. In the latter case, the use of a filter flask (side-arm flask), together with a centrifuge tube with a rubber cone, which is empty, can be effective. The centrifuge tube is filled with ice or carbonic ice at a distance of around 2 cm from the bottom of filter flask (side-arm flask), and this is placed on a heat source (see Figure 10.9).
Answer:
Sublimation is a process by which a solid directly changes into its gaseous form , without passing through its liquid form