Recrystallization Lab Essay

Re quartz glasslization is a method utilise for purifying solid organic compounds. It is the most cost-effective method to purify and remove impurities from a solid to aloneow a crystal to grow. The method is when the solute in a hot resolving power yields to a solution. Once the solvent cools, the solution is saturated with respect to the solute, which is when it recrystallizes. A crystal is the end result of the method and it is a single pure signification with the impurities being excluded from it. The recrystallization method can be broken down into septette steps 1) Choosing the solvent, 2) Dissolving the solute, 3) Decolorizing the Solution, 4) Filtering suspended solids, 5) Recrystallizing the solute, 6) Collecting and washing the crystals, and 7) Drying the product. Activated fusain is used in Recrystallization to absorb the impurities that are in the solution.Experimental parting1) Recrystallization of Phthalic sulphurous2) Recrystallization of benzoic Acid3) Recrys tallization of NaphthaleneTable of ChemicalsMelting point change state PointMolar MassColorPhthalic Acid230CDecomposes166.13 g/ wallWhiteBenzoic Acid122.4C249.2C122.12 g/moleNot availableNaphthalene80.2C218C128.19 g/molewhiteResultsPhthalic AcidBenzoic AcidNaphthaleneMass.143 g.126g (w/ pop water).098g (w/ water).439gPercent Recovery71.5% (0.143g/0.2g)252% (.0126/0.05g)196% (0.098g/0.05g)43.9% (0.439g/1.0g)Melting Point220C110C (w/ by water)105C (w/ water)70CDiscussionThe portion recovery of Benzoic Acid is way above carbon%. This indicates that an computer error was performed during the essay. Phthalic Acid melted just 20C less than the stock melting point for Phthalic Acid. Naphthalene melted 10C less and Benzoic Acid also did not reach the standard melting point. Reasons for a low percent Recovery for Phthalic Acid and Naphthalene is probably because not all of the solid were collected when filtered out.Reasons for Benzoic Acid being over 100 % is probably because there wa s an excess of solute and it was not filtered out correctly.ConclusionTo conclude, the experiment was successful in creating crystals and removing them from impurities. Only fault was not taking out enough of the crystals to get the right percent recovery. The techniques for recrystallization can be used for any chemicals as long as there is a solvent that it can mix with and it is an impure compound.ReferencesWeldegirma, Solomon. Laboratory Manual CHM 2210L and CHM 2211L. Tampa Chemistry Department, 2014. Print. Phthalic Acid Msds. Science Lab. N.P., n.d. Web. 30 Sept. 2014 Recrystallization Technique. www.rhodium.ws. N.p., n.d. Web. 29 Sept. 2014.