aj47 Posted October 30, 2005 Share Posted October 30, 2005 I recently synthesised aspirin by refluxing 2-hydroxybenzoic acid with ethanoic anhydride. Then filtering and recrystalizating with HCl I obtained about 1 or 2 grams of the impure aspirin. Hears my question, when i dried the crystals in the dessicator on filter paper it burnt a hole right through. I know ethanoic acids is a biproduct but surely its not responsible. Anyone know what happened??. Link to comment Share on other sites More sharing options...
aj47 Posted November 1, 2005 Author Share Posted November 1, 2005 anyone? Link to comment Share on other sites More sharing options...
budullewraagh Posted November 1, 2005 Share Posted November 1, 2005 did you wash the crystals? Link to comment Share on other sites More sharing options...
akcapr Posted November 2, 2005 Share Posted November 2, 2005 I think one of the acids is responsible for this Link to comment Share on other sites More sharing options...
woelen Posted November 2, 2005 Share Posted November 2, 2005 Did you use excess acetic anhydride? I can imagine that this esterificates the hydroxyl groups in the paper. It is a really strong acylation agent. This acylation probably causes breakdown of the paper. It is known that acetic anhydride is very corrosive and must be handled with care. Link to comment Share on other sites More sharing options...
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