L> Crystallization from a supersaturated solution Revised, August 3, 2020Crystallization of Sodium Acetate from aSupersaturated Solutionby Oliver SeelyThis Net web page, accompanying photos and also video are in the public domajor and also might be copiedwithout restriction. All files are located in the very same subdirectory in which you find this web page.An aqueous solution can be rendered supersaturated by first dissolving the solute in water atan elevated temperature utilizing enough to give a concentration simply under its solubility at thattemperature. After the last of the solute crystals have dissolved the solution is cooled. Thecooled solution has a concentration over the saturation point and also is shelp to besupersaturated. Crystals perform not develop unless the cooled solution is disturbed insome way, a lot of regularly by allowing it to come right into contact with a little crystalline fragment of thesubstance. The version supplied to explain this phenomenon is that when a template of the crystallineform of the substance is made available to the supersaturated solution, spontaneouscrystallizationbegins immediately. Here is a supersaturated solution of sodium acetate in water.. The stopper is rerelocated and reput through a stopper holding a thermometer. Often, that adjust in environment is enough to begin crystallization, though in this instance it did not. The stopper is loosened and a couple of seed crystals are introduced on a spatula to the optimal of thesupersaturated solution. In this solution there is a peak layer which is not supersaturated owing tosome distilled water which was presented to wash down the inner wall simply before heating. Note that the crystals start to grow immediately from the spot where the seed crystals dropped to theallude of supersaturation. Within a couple of seconds, the crystals have grvery own nearly to the bulb of the theromometer. The crystals grow previous the bulb. Finally, the crystallization process is finish and also has actually adjusted the appearance of the contentsfrom a transparent solution to an inhomogeneous and also opaquemixture.The last temperatureis more than 25 OC, above the founding point; the room temperature was cshed to 20OC and also the final temperature is cshed to 47 OCClick here to view the demonstration showing the procedure and also its exothermicnature.Click right here to view the demonstration in MPEG formatand also compatible through Windows Media Player and Real Player Plus G2.
You are watching: Describe how you would prepare a supersaturated solution
See more: What Did The Lion Want In The Wizard Of Oz ? Character Archetypes: “The Wizard Of Oz”
(Documents dimension =16.7MByte)Downloading this file will certainly take just 4 minutes with a T3 link and also around 90minutes through a 28.8 kbaud modem.If you are a PC user and wish to have manage over wbelow the downloaded video file is stored,hold the change vital down as you click the computer mouse on the attach above and then suggest thesubdirectory wright here the file is to go. Once you understand the location of the stored file, youhave the alternative of choosing either Real Player or Windows Media Player to view the file.Click here to rerevolve toOliver"s Index of Chemical Demonstrations and also Helpful Hints in Laboratory