SC CHEM 333 - Synthesis of Phthalic acid Post-Lab (3 pages)

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Synthesis of Phthalic acid Post-Lab



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Organic Chemistry 333L section 03M Laboratory Post Lab Synthesis of Phthalic acid Synthesized by Cameron Kahn 14 January 2019 TA James Collie 1 Page Results Observations Phthalic acid is a white crystalline precipitate While doing the experiment there were no visible signs of impurities The recrystallized crystals looked long clear and shard like white stained glass Data Initial mass of phthalic acid 0 10grams Recrystallized mass of phthalic acid 0 075grams Melting Point of recrystallized product 209 C Percent Recovery mass 75 0 Percent Difference temperature 9 1 Calculations Percent Recovery Amount Pure Solid 100 Percent Difference T reference T sample 100 Amount Impure Solid T reference 75 0 0 075 gram 100 0 10 gram 230 209 230 100 9 10 temperature Percent yield mass of recrystallized sample x 100 mass of crude sample 075grams recrystallized x 100 75 yield 10grams crude percent yield and percent recovery are used interchangeably and both calculations are done in the same fashion however the correct usage for the experiment on recrystallization would be to use percent recovery Conclusions Recrystallization is a fast and convenient method for purification of a substance The basic process behind recrystallization is to dissolving the substance in a liquid apply heat until solution reaches its melting point and then cool the solution Upon recrystallization of the crude sample of phthalic acid about 75 of pure phthalic acid remained after the removal of all soluble and insoluble purities The melting point obtained in the experiment was measured to be 209 C The actual melting point for phthalic acid is measured to be 230 C The measured percent difference in temperature is calculated to be 9 1 Comparing the experimental to the actual melting point one can only hypothesis that there were still impurities present within the recrystallized pure product This is due to a human error involving the suction filtration system and not appropriately filtering the recrystallized



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