Iment Title: Acid-Base Extraction

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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. In the end of the process, impurities become physically separated from the now pure compound, facilitating further transferring and further repurification / extraction if needed. MATERIALS AND METHODS Acetanilide tert-butyl methyl ether p-tert-butylphenol p-toluic acid 0.5M NaHCO3 3M HCL 0.5M NaOH NaSO4 anhydrous Separatory Funnel Buchner filter paper Sand Bath Microspatula Disposable Pipet heated plate boiling chips support stand Pasteur pipets with latex bulb test tubes (2) utility clamp watch glasses weighing paper melting pint capillary tubes thermometer EXTRACTION •Dissolve acetanilide, p-toluic acid, and p-tert-butylphenol in t-butylmethyl ether •Extract p-toluic acid from the ether layer with NaHCO3 solution •Extract p-tert-butylphenol from the ether layer with NaOH

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