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Preparation of ethanol
Member rating: No Rating | Words: | Submitted: Mon Jun 19 2006
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This preparation produces ethanal in aqueous solution. It is invariably contaminated with a small amount of ethanoic acid. * Place 50 cm3 of water in a 500 cm3 round-bottomed flask, and add slowly with shaking 17 cm3 of concentrated sulphuric acid: then add some anti-bumping granules. * Why must the sulphuric acid be added slowly and with shaking? * The reaction of sulphuric acid with water is dangerously exothermic. Sulphuric acid is almost twice as dense as water, so if two layers are allowed to form and are then mixed it is possible to generate steam which will spray the acid about. * What are anti-bumping granules and what is their purpose? * The granules are silica, and prevent the sudden formation of large gas bubbles that lead to 'bumping' or succussion. * Assemble the flask containing the sulphuric acid into a distillation apparatus. The stillhead carries a tap...
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