14 oktober 2022
Chemical/Laboratory Techniques: Recrystallization
This open video (CC-BY-NC-SA) was created by chemistry teachers of the Faculty of Science and Engineering of the University of Groningen for use in the lab at their faculty. The description of for the video reads the following: 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. This video contains royalty-free music from Bensound.com, obtained via their free license (song: Tenderness - Benjamin Tissot; https://www.bensound.com/royalty-free-music/track/tenderness; License: https://www.bensound.com/terms-and-conditions). Please provide proper attribution to this source if you reuse sections of this OER video containing this music.