Radu Purtuc | Chemistry 231 - Lab | Section 32 Ronnie :: team-member TECH 705, SEPARATING ACIDS AND NEUTRAL COMPOUNDS BY SOLVENT EXTRACTION - MACROSCALE EXTRACTION July 6, 2006 Lab Report INTRODUCTION Purpose: using extraction technique to separate acetanilide, p-toluic acid, and p-tert-butylphenol; then measure the melting points of each compound and comparing them to the statistical values. Background: separating acids and neutral compounds by solvent extraction is a useful technique used in practice by chemists to separate organic compounds from mixture of other compounds. It generally involve several steps, with limiting factors being the number and output purity of compounds to be extracted from source mixture. A number of specific compound solvents not inter-miscible are used to separate and dissolve compounds, and a physical transfer between solvents is employed. An example of use is cleaning compounds of impurities, where different solvents work as a molecular filter that interacts differentially with compound and impurities respectively.
0.9 0.8 0.7 Absorbance 0.6 0.5 0.4 0.3 0.2 0.1 0 400 450 500 550 600 650 700 750 λ max 500 nm 550 nm • • Make sure you understand the directions for using the spectrophotometer and have them written in your manual. Complete the questions on the prelab page. Introduction: There are many different chemical methods that can be used to determine the concentration of a solution. You have already used one method, titration, to find the concentration of Ca+2 ions in a sample of water, and another, density, in finding the concentration of ethanol. In this lab you will use a method called visible spectroscopy to determine the concentration of a solution of CoCl2.
Magic marker inks are often mixtures of several compounds. Paper chromatography is a common method of separating various components of a mixture. After separation, you can observe the different colors that make up a particular color of magic marker ink. You can also calculate a ratio Rf, which compares how far each compound traveled to how far each solvent (substance that dissolves another substance) traveled during the experiment. Rf = Ds/Df Ds = Distance traveled by the compound Df = Distance traveled by the solvent Materials: coffee filter, tape, isopropyl alcohol (rubbing alcohol), water, 3 different color magic markers (not permanent); 3 identical tall, narrow drinking glasses; metric ruler, 3 pencils Pre-lab Questions: List one extensive and one intensive property of marker ink.
Experiment#2 “Separating the Components of a Ternary Mixture” By Mohammad Bazargan Lab partners: Aaron Radtke, Kevin Campbell, Austin Gilchrist Instructor: Professor Mundell Section #: 12 Sep/14/2011 Abstract In this laboratory, we used physical and chemical properties to separate the components of a ternary (three substances) mixture. We also determine the percentage of each substance in the mixture. The percentages are the following,38.2% NaCl, 40.45% SiO2, and 72.84% CaCO3.The mentioned substances were all separated using methods such as filtration, evaporation and reaction with other chemicals which will be explained throughout this report. Intro Mixtures are \ physical combinations of two or more substances where each substance keeps its own chemical identity. Mixtures can be classified as either homogeneous or heterogeneous.
Acetanilide is also used as an intermediate for the synthesis of rubber accelerators, dyes, and is used as a precursor in penicillin synthesis. The melting point of the base was determined to be between 80-87 degrees. Based on the melting point we identified the identity of our base as Ethy-4-amiobenzoate. Ethy-4-amiobenzoate is an anesthetic which is applied topically to the skin and mucous membrane and is also used to suppress the gag reflex in various
A binding material can be separated by dissolving the tablet in ether since three active ingredients are soluble. Then, aqueous K2HPO4 and KOH are used to extract the ether solution with the conjugate base of the Aspirin layer and the conjugate base of the Acetaminophen, respectively. The caffeine can be isolated from the left over layer by evaporating the ether. Two separated solutions form solid by acidifying with HCl and the solid residue can be collected by vacuum filtration. According to the Revell's lab experiment, aspirin, acetaminophen, caffeine recoveries are 60% or higher, <10% and <5%, respectively.
It is concluded that these are the three ingredients in a tablet of Excedrin. By using the line equation and the calculations represented in appendix A, this is how much of each ingredient is in an Excedrin tablet. References: 1. Williamson, Kenneth L., and Katherine M. Masters. Macroscale and Microscale Organic Experiments.
This technique can be used with aluminum cans but only after removing the exterior paint and the interior plastic coating. Alum is a chemical used in a myriad of applications including water purification, marble cement, explosives, tanning, hardening gelatin, baking powders, clarifying sugar, hardening plaster casts, and as a medicinal astringent. In this experiment, you will produce alum from an aluminum can in a multi-step synthesis reaction summarized by equation 1. You will then purify the alum through a process called recrystallization and
6/28/2012 The 1st lab procedure performed was the gram stain. Previously, before starting the gram stain I prepared a bacterial smear on a glass slide and used the heat fixing method which was done to help the bacteria cells adhere to the glass, kill them, and also helps make the cells easier to stain by coagulating the cells proteins. The gram stain test helped me identify rather my bacterium would be a negative or positive and determined the microscopic morphology (shape, and arrangement) of my bacterium as well. The test
p-Aminobenzoic Acid Blake Thilmony*, Dillon Hofsommer Department of Chemistry, North Dakota State University, P.O. Box 6050, Fargo, North Dakota 58102 *Blake.M.Thilmony@my.ndsu.edu Received March 28, 2011 ____________________________________________________________ ____________ P-aminobenzoic acid was synthesized with a three-step reaction involving the addition and removal of a protecting group, to result in a higher yield when oxidation occurs. The synthesis was followed by the isolation and analysis of the product using methods of vacuum filtration and NMR spectroscopy. The experiment had some errors during synthesis involving transferring and formation of byproducts and impurities, and resulted in a modest 48.9% yield. ____________________________________________________________ ____________ Introduction1 The purpose of this experiment was to prepare the vitamin p-aminobenzoic acid, or PABA.