Lecture 2 - Recrystallization

Lecture 2 - Recrystallization - Before next weeks lab you...

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Unformatted text preview: Before next weeks lab you should Before next weeks lab you should Complete Melting Points pre-lab quiz Write up Pre-Lab report in your notebook: Melting Points Recrystallization Use Lab Notebook handouts available online Bound manuals available mid-week next week Reminder: We are unable to re-open quizzes Computer issues, etc., are your responsibility Lab goggles must be worn AT ALL TIMES! Three samples of the same compound... How can you determine which is the most pure? 1) Take the melting point . 2) Compare the color . 3) Compare the crystal size . brown white grey medium large small Can anyone guess the identity of this compound? What is rock candy? Rock candy is the purest form of sugar available. A hot, supersaturated solution of cane sugar and water is poured into large tanks. This heating process busts apart the molecular crystal lattice of the sugar (sucrose), freeing any impurities. Under carefully controlled conditions, the molecules of sucrose rejoin during the cooling process , this time, excluding the impurities . This allows the formation of larger, purer crystals which are subsequently (and deliciously) harvested as Rock Candy. Information and photographs courtesy of Dryden & Palmer Rock Candy, http://www.rockcandy.com Rock candy is recrystallized cane sugar. Recrystallization The process of recrystallization involves (1) Dissolution of the solid in an appropriate solvent at an elevated temperature , followed by (2) subsequent re-formation...
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Lecture 2 - Recrystallization - Before next weeks lab you...

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