Methods and Materials 0.4g maleic anhydride and 1ml ethyl acetate was added to a test tube and mixed until dissolved. 2ml hexane was then added to the test tube, followed by 0.4ml cyclopentadiene. The test tube reacted for 5 minutes in a test tube rack and then 2 minutes in an ice-bath to allow for complete crystallization. The crystals were then put through the filtering apparatus to collect and dry all the crystals. About 3ml was used to rinse the crystals while in the apparatus. The crystals were then dried and the yield and melting point were taken.
Results
• Maleic anhydride = 0.4g (0.004 moles)
• Ethyl acetate = 1ml
• Hexane = 2ml + some to rinse crystals
• Cyclopentadiene = 0.4ml (0.0048 moles)
• Filter paper before = 0.18g …show more content…
Cyclopentadiene will act as the diene and maleic anhydride will act as the dienophile. During the experiment two trials were conducted because the after the cyclopentadiene was added to the first test tube, the reaction produced a weird very chunky white product. For the second trail, after cyclopentadiene was added, the reaction occurred slowly. The reaction was happening because the test tube was getting warmer, which means it was exothermic; however, the formation of the crystals did not happen right away. When pouring the contents of the test tube into the filtration apparatus, the crystals dried into very fine pieces that had a fluffy texture and were a little shiny. 0.46g of the product were collected which led to a 70.12% yield. The limiting reagent of the reaction was maleic anhydride which calculated to a theoretical yield of 0.656g. The observed melting point was 144°C and the ideal melting point is about 20 degrees higher at 165°C. Sources of error that could have led to a lower percent yield are losing crystals during the transfer to the bigger filter paper or if the reaction did not fully proceed to the end. A lower melting point shows an impurity of the final product collected and this could have been due to any water or liquid still left in the crystals; one
Results
• Maleic anhydride = 0.4g (0.004 moles)
• Ethyl acetate = 1ml
• Hexane = 2ml + some to rinse crystals
• Cyclopentadiene = 0.4ml (0.0048 moles)
• Filter paper before = 0.18g …show more content…
Cyclopentadiene will act as the diene and maleic anhydride will act as the dienophile. During the experiment two trials were conducted because the after the cyclopentadiene was added to the first test tube, the reaction produced a weird very chunky white product. For the second trail, after cyclopentadiene was added, the reaction occurred slowly. The reaction was happening because the test tube was getting warmer, which means it was exothermic; however, the formation of the crystals did not happen right away. When pouring the contents of the test tube into the filtration apparatus, the crystals dried into very fine pieces that had a fluffy texture and were a little shiny. 0.46g of the product were collected which led to a 70.12% yield. The limiting reagent of the reaction was maleic anhydride which calculated to a theoretical yield of 0.656g. The observed melting point was 144°C and the ideal melting point is about 20 degrees higher at 165°C. Sources of error that could have led to a lower percent yield are losing crystals during the transfer to the bigger filter paper or if the reaction did not fully proceed to the end. A lower melting point shows an impurity of the final product collected and this could have been due to any water or liquid still left in the crystals; one