EXP267

=Researcher= Alex Greene

=Objective= Determination solubility of 4-chlorobenzaldehyde in ethanol at room temperature (25C) =Procedure= 1. Weigh 4-chlorobenzaldehyde 2. Measure ethanol and combine with 4-chlorobenzaldehyde 3. Heat solution until all 4-chlorobenzaldehyde dissolves 4. Place solution in 25C water bath to cool 5. Cool until precipitate forms 6. Filter precipitate by vacuum filtration =Results=

=Log 3/5/12=

13:29-10ml of absolute ethanol measured. 13:34-6.9954g of 4-chlorobenzaldehyde weighed out. 13:40-4-chlorobenzaldehyde transferred to test tube #1 13:41-Ethanol added to test tube #1, covered with paraffin and capped then inverted several times. (solid 4-chlorobenzaldehyde persists) 13:43-Test tube #1 transferred to water bath at 27C (solid still persists) 13:48-Test Tube #1 water bath at 31C,inverted several times (Solid 4-Chlorobenzaldehyde dissolving but some persists) 13:53-Test Tube #1 water bath at 35C, inverted several times (Solid 4-Chlorobenzaldehyde dissolving but some persists) 13:55-Test Tube #1 water bath at 42C, inverted several times (Solid 4-Chlorobenzaldehyde dissolving but some persists) 13:56-Test Tube #1 completely dissolved and transferred to water bath at 24C 14:02-No precipitate forming Test tube #1, water bath at 24C (Sonicated for 2 seconds) 14:07-Precipitate began to form, water bath at 24C 14:09-Rapid precipitate formation, slurry like solution results. 14:36-Slurry solution from test tube #1 vacuum filter 14:40-Supernatant liquid transferred to beaker #1 14:45-Beaker #2 weighted empty 26.9698g 14:55-Dried crystals transferred to beaker #2 14:57-Beaker #2 weighted with crystals 28.8867g 14:57 Beaker #1 and #2 stored for NMR