1. Chapter 6 Sublimation

2. Sublimation
Sublimation is the process whereby a solid evaporates from a warm surface and condenses on a cold surface as a solid.
Sublimation is preferred over crystallization for < 100mg purification as there is little loss of material.
Use apparatus shown in Figure 6.21, p You are to use vacuum sublimation for high mp substances (>80oC). Vacuum line is attached to the side arm of the filter flask.
Sublime two known and one unknown substance.
Determine mass, % yield, and mp for unknown characterization (Table 6.3, p. 132).
NOTE: Do NOT get water in the apparatus

3. Postlab Questions (also stated in the lab handout)
What is the preparative benefit of sublimation?
Cite some example of substances that sublime. According to your experience, how can one improve the sublimation process?