Impurity

Purpose: The purpose of this laboratory was to synthesize isopentyl acetate, commonly known as banana oil, in a reaction of methanol and isopentyl alcohol catalyzed by sulfuric acid. Through this Fischer esterification reaction, it was possible to learn about using a Reflux condenser to run a reaction as well as purifying the product through various washes and extractions along with simple distillation. In addition, the product of the experiment was carefully analyzed based upon boiling point,…

of five replicate injection should be NMT 2.0% 0.42 0.90 Specificity Peak of Aminexil and Minoxidil should be pure Peaks of Aminexil and Minoxidil are pure. The degradation products should be well resolved from Aminexil and Minoxidil peaks All Impurity degradation products were well separated from Aminexil and Minoxidil peak and each other. Peak purity criteria for Aminexil and Minoxidil should be pass in all stress testing conditions Pass Pass System precision The RSD of the Retention…

recrystallization to isolate the acetanilide product from small amounts of impurities, acetic acid. Recrystallization is a very effective way for organic chemists to isolate a solid product from a small amount of impurities but cannot be used for liquids. The crude acetanilide product and the recrystallized acetanilide were compared using melting point determination and the recrystallized product was then classified and checked for impurities by determination of IR and 1H NMR spectra. Results…

melting point range of caffeine was found to be 232.7°C-235.1°C. The difference in melting point ranges demonstrates that the sample of caffeine contained impurities. Such impurities were marked as brown specs in the sample, which was white. The three low percent yields and the difference in Rf values resulted from the existence of such impurities.…

Despite the melting point range for the substance recovered from organic solution III being relatively narrow compared to the other two, the melting point was high for the aspirin. This indicates that the substance contained an impurity, and after analyzing the spectrum, this impurity was most likely caffeine, which has a higher melting point. According to the IR spectrum, organic solution IV did contain caffeine as predicted, but there are peaks that indicate the substance recovered also…

acid impurity. There were two parts to the isolating a neutral compound experiment. First, an acid impurity have to be tested. After two extractions of the aqueous layer, using macroscale technique, 6M HCl were added to each layer - in separate flasks - until both mixtures are acidic. Based on Data Table 4, it took more drops of HCl to acidify the first flask than the second flask. There was much more precipitate in the first flask as well. This most likely indicated that the acid impurity…

through a mixed melting point that ensured proper identification and whether impurities were present in the isolated compounds. The compounds were found to be benzoic acid and benzoin. TLC was then conducted to determine if impurities were present. The IR spec was then conducted to ensure proper…

Summary The goal of the experiment was to determine weight % of sulfate inside an unknown sample compose of Na2SO4. The sample was dried, weighed and dissolved in water and hydrochloric acid. Barium chloride was then added in excess to drive the precipitation process to completion. Heat was use to digest the precipitate before it was filtered through an ashless filter paper and ignited to constant weight. From mass of the sample and mass of the precipitate, the percentage of sulfate in the…

limestone that has few impurities, the marble turns white. If the marble contains clay minerals, iron oxides, or bituminous minerals, the marble will turn a different color. The different color of the marble all depends on the kind of impurity that is in the limestone. The most common color marble is white, but there are also pink, gray, bluish, yellow, or black marbles. These colors are more rare than the white because the limestone that makes the marble normally has very few impurities. Now…

Boil 1985). The conditions during growth of the crystal influence the development and morphology of the crystal. The morphology of a crystal grown in the presence of impurities is influenced greatly at the faces of the crystal most affected by the adsorption of impurities (Morel du Boil 1985). Therefore, the presence of impurities was thought to possess the greatest influence on crystal growth and morphology, while other factors were thought to possess a less significant effect. “Crystal…