Sublimation of Non-Polar Iodine Add iodine crystals to a pre-heated 2 L Erlenmeyer flask on a hotplate and observe the sublimation and subsequent formation of beautiful crystals. Easy sublimation is due to lack of permanent charge. Solubility of Polar vs. NonPolar Gases in Water An HCl fountain can be used [1] [2] [3] [4] to demonstrate the high solubility of HCl in polar water. Compare to oxygen, nitrogen. References Alyea, H.N.; Duton, F.B. "Tested Demonstrations in Chemistry", J. Chem. Educ., Easton, PA 1965, p. 13-14 Ned Steadman. J. Chem. Educ., 1992, 69 (9), p 764 Nicholas C. Thomas and Stephen Faulk , Randy Sullivan J. Chem. Educ., 2008, 85 (8), p 1063 J. Chem. Educ., 1995, 72 (9), p 828 Contributors Ed Vitz (Kutztown University), John W. Moore (UW-Madison), Justin Shorb (Hope College), Xavier Prat-Resina (University of Minnesota Rochester), Tim Wendorff, and Adam Hahn.