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    different solvents of different polarities. In this experiment‚ a silica column is used as a stationary phase to aid the separation by providing an interaction for the compounds in the solution besides the solvent. This allows the mixture compound to form separating polarity layers in the column. A non polar solvent pentane is used first for its high interaction with non polar compounds and a lower interaction with polar solvents. Since non polar compounds are more soluble in nonpolar solvents‚ it would

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    challenging task for the researchers. In this present review‚ an attempt has been made to give an overview of certain extractants and extraction processes with their advantages and disadvantages. Keywords: Medicinal plants‚ phytochemicals‚ extraction‚ solvent‚ screening. INTRODUCTION extracts. Such preparations have been popularly called Plant-derived substances have recently become of galenicals‚ named after Galen‚ the second century great interest owing to their versatile applications. Greek physician

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    Chem 201 - Extraction

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    Wayne Xie Chem 201 10/02/2012 Objectives : 1)To purify samples of organic compounds that are solids at room temperature. 2)To dissociate the impure sample in the minimum amount of an appropriate hot solvent Chemical Index : Naphthalene; mp 82 *C 1‚4-Dichlorobenzene; mp 56 *C 4-Chloroaniline; mp 68 - 71 *C; pKb 4.15 Ethyl 4-Aminobenzoate; mp 90 *C; pKb 4.92 Procedure : Partition Coefficient of Benzoic Acid 1) Carefully

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    principle. Organic molecules dissolve in organic solvents and polar molecules dissolve in aqueous solvents. This phenomenon is observed because of the intermolecular forces between solvent and solute molecules. For example‚ in aqueous solvents‚ the polar solute can interact with the solvent via hydrogen bonding‚ electrostatic forces‚ ion dipole forces‚ dipole-dipole forces and London forces. All of these can help a polar solute dissolve in an aqueous solvent. Polar molecules can be involved in these interactions

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    for this are NaI in acetone. NaI is soluble in acetone but the products of the reaction; NaCl and NaBr are not. We will watch the reaction by looking for the first appearance of the solid salts. Acetone is a good solvent for Sn2 reactions because it is a polar aprotic solvent. We will be examining Sn2 reactions with an ethanolic solution of silver nitrate. The silver ion coordinates with a lone pair on the halogen which begins to weaken the carbon-halogen bond. In the rate determining

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    temperatures. It is also the process in which the solid to be crystallized is dissolved to either a hot solvent or a hot solvent mixture and is cooled in a solution.In this experiment‚ acetanilide‚ the crude product of acetylation of aniline and acetic anhydride‚ was used as the pure organic compound. Crude acetanilide underwent crystallization process using the preferred recrystallizing solvent‚ water. The crystallization process was when crude acetanilide was placed in hot water bath and was cooled

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    dissolved or emulsified oiland grease from water by using an extracting solvent. The common solvents used aren-hexane‚ methyl-tert-butyl ether (MTBE)‚ and trichlorotrifluoroethane. Any filterable solvent-soluble substances (e.g.‚ elemental sulfur‚ complex aromatic compounds‚ hydrocarbon derivatives of chlorine‚ sulfur‚ and nitrogen‚ and certain organic dyes) that are extracted and recovered are defined as oil and grease. No known solvent will dissolve selectively only oil and grease. Heavier residuals

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    reactions‚ a solution of organic acid (benzoic acid)‚ a water soluble compound cellulose‚ and an organic soluble compound methyl orange‚ can be separated and benzoic acid can be isolated by a method of extraction. At the fundamental level‚ organic solvents separate from aqueous solutions based on their varying densities‚ typically the organic layer being less dense and therefore on top of the aqueous layer1. Therefore any solutes in those solutions are also separated and can be isolated from one another

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    Experiment18 Aim To determination the partition coefficient of ethanoic acid between water and butan-2-ol. Procedure 1. The room temperature was recorded. 2. 15cm3 of the given aqueous ethanoic acid and 15cm3 of butan-2-ol were poured into a 100cm3 separating funnel‚ using suitable apparatus. The funnel was stoppered and was shook vigorously for 1 to 2 minutes. (The pressure in the funnel was released by occasionally opening the tap.) 3. 10cm3 of each layer was separated

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    reaction. Oxidation of the porphyrinogen during the reaction yields the porphyrin .Usually porphyrins are purified by column chromatography often traditional halogenated solvents. However in this green chemistry experiment‚ a safer chromatography solvent mixture (hexanes and ethyl acetate) is used to help with the avoidance of solvent usage‚ the use of solid supported reactions and the use of alternative energy sources. Materials & Methods * 0.43ml of Benzaldehyde 0.30ml of pyrrole

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