Recrystalization of Benzoic Acid

1309 Words6 Pages
Recrystallization of the Benzoic Acid Antonio Roki CHE 311L: Organic Chemistry I Section #2 September 14, 2012 Recrystallization of the Benzoic Acid Summary: The purpose of this experiment was to determine if the process of the Recrystallization is the good method of purification of the solid substance based on its different solubility values. This experiment conducted the purification of the Benzoic acid. The melting point range of the impure Benzoic acid was determined to be 86- 108 °C. Melting point was measured one more time after the process of the purification and was determined to be 111-117 °C. The melting point ranges of the impure and pure benzoic acid seemed reasonable. The difference between the literature melting point values of the pure Benzoic acid 21.5-22.5 is different than the one determined in the experiment. The recrystallization was experimentally showed as an inaccurate purification method. Introduction: Recrystallization is the purification technique in which a solid slowly forms, crystallize, from a liquid solution. It is based on the manipulation of the solubility at various temperatures. To have an successful recrystallization of the solid, there has to be an ideal solvent meaning the liquid in which the solid or solute is infinitely insoluble at room temperature and infinitely soluble at high temperature. This experiment will determine if the Benzoic acid will truly be soluble in the polar solvent such as water. It will also show the efficiency of the recrystallization process by comparing the experimental and literature values of melting point of the pure benzoic acid. Experimental: The experiment started with measuring the melting point range of impure benzoic acid. The open end of a capillary tube was then tapped into the sample to be tested until 2-3 mm of the sample was in the capillary tube. The tube was

More about Recrystalization of Benzoic Acid

Open Document