SC CHEM 333 - Acid Catalyzed Esterification Pre-Lab (7 pages)

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Acid Catalyzed Esterification Pre-Lab



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Organic Chemistry 333L section 03M Laboratory Pre Lab Acid Catalyzed Esterification By Cameron Kahn 29 October 201314 January 2019 TA James Collie Objectives In this lab one will learn to synthesis an ester from an unknown alcohol by means of an acid catalyzed esterification He she will purify the product by means of distillation Finally one will record any data and determine the boiling point Theory In general esters have a low molecular weight and often have a pleasant aroma Because of these factors esters are used in the food industry as artificial flavors and in the perfume industry as fragrances Handy The synthesis of esters is very important to both industries in particular Esters can be prepared through a reaction of carboxylic acid with the presence of an alcohol The acid catalyzed conversion between the carboxylic acid and alcohol to form an ester is called Fischer Esterification Fischer Esterification This reaction can be done in reverse but still be slow This cannot be said about the acetic anhydride ester synthesis During the acid base extraction sodium bicarbonate is used to neutralize the acid Once added the sodium bicarbonate will form carbon dioxide which will in turn cause pressure build up in the apparatus Throughout the esterification he she will need to vent the apparatus often Lastly the use of micro boiling point techniques will determine the boiling point This technique is used when there is only a small amount of liquid left about 2 3 mL of desired product from the reaction 1 Page Mechanism As noted in the Chemistry 333 lab manual written by George Handy Step 1 Step 2 Step 3 2 Page Procedure Start by setting up a 25 mL round bottom flask equipped with a reflux condenser apparatus Handy Lightly grease all glass connections and then sink the round bottom flask into the heating mantle Next he she will add 15 mL of acetic acid 1 5 mL of concentrated sulfuric acid and 2 mL of unknown alcohol to the 25 mL round bottom flask Set the Variac between



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