Chemical/Laboratory Techniques: Recrystallization

Recrystallization is based on the principle that the solubility of most solids in a solvent increase with increased temperature. The setup used is explained in the following video: Building a reflux setup (https://youtu.be/kylffAXH-ls). Recrystallization involves dissolving the material to be purified (the solute) in a minimal amount of appropriate hot solvent. As the solvent slowly cools, the solution becomes saturated with the solute and the solute crystallizes out (reforms a solid). As the crystal develops, impurities are excluded from the crystal lattice, thereby completing the purification process. The crystals can then be collected, washed, and dried. Music used: Tenderness - Benjamin Tissot (https://www.bensound.com/royalty-free-music/track/tenderness) From bensound.com under their free license (https://www.bensound.com/terms-and-conditions) This video was created by N.N.H.M. Eisink, PhD, and T.R. Canrinus, PhD of the Faculty of Engineering and Science of the University of Groningen as an Open Educational Resource (OER) This video has been released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC-BY-NC-SA 4.0) by the University of Groningen (https://creativecommons.org/licenses/by-nc-sa/4.0/) The video can be downloaded from the OER platform Edusources for purposes allowed under the license terms: https://edusources.nl/en/materials/0dccc6a8-5ef8-43e7-92f8-f21b815fc40e