Recrystallization is a method used for cleansing solid organic substances. It is the most efficient approach to cleanse and remove impurities from a strong to allow a crystal to grow. The method is when the solute in a hot solvent yields to an option. Once the solvent cools, the service is saturated with regard to the solute, which is when it recrystallizes. A crystal is completion result of the method and it is a single pure substance with the impurities being omitted from it.
The recrystallization method can be broken down into seven actions: 1) Picking the solvent, 2) Dissolving the solute, 3) Decolorizing the Service, 4) Filtering suspended solids, 5) Recrystallizing the solute, 6) Gathering and washing the crystals, and 7) Drying the product. Activated Charcoal is utilized in Recrystallization to soak up the pollutants that are in the option.
1) Recrystallization of Phthalic Acid
2) Recrystallization of Benzoic Acid
3) Recrystallization of Naphthalene
Table of Chemicals
230 ° C. Decomposes.
White. Benzoic Acid.
122.4 ° C. 249.2 ° C. 122.12 g/mole.
80.2 ° C. 218 ° C. 128.19 g/mole.
.126 g (w/ out water).
.098 g (w/ water).
71.5% (0.143 g/0.2 g).
252% (.0126/ 0.05 g).
196% (0.098 g/0.05 g).
43.9% (0.439 g/1.0 g).
220 ° C. 110 ° C (w/ out water).
105 ° C (w
70 ° C. Discussion. The percent healing of Benzoic Acid is way above 100%. This shows that an error was carried out during the experiment. Phthalic Acid melted simply 20 ° C less than the basic melting point for Phthalic Acid. Naphthalene melted 10 ° C less and Benzoic Acid likewise did not reach the standard melting point. Reasons for a low percent Recovery for Phthalic Acid and Naphthalene is most likely because not all of the solid were collected when filtered out.
Factors for Benzoic Acid being over 100 % is probably because there was an excess of solute and it was not filtered out correctly.
To 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.
Weldegirma, 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.
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Recrystallization Lab. (2016, Jun 03). Retrieved from https://studymoose.com/recrystallization-lab-essay