Melting point 1. What two effects do impurities have on the melting point of an organic compound? Soluble impurities affect the melting point of a solid in the following manner. a. The presence of an impurity in the molten compound reduces its vapor pressure thus lowering the melting point of the compound. b. Broaden the melting point range. 2. For what tow purpose are melting points routinely used a. To determine the identity of an organic solid. b. To determine the purity of an organic solid
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distillation -- and was characterized by its boiling temperature and its refractive index. Esterification is a condensation reaction where two molecules are joined together to form a larger molecule with the simultaneous loss of water. This ester in this experiment is isopentyl acetate formed from acetic acid and isopentyl alcohol. The reaction is catalyzed by hydrochloric acid‚ a Fisher esterification process‚ (McMurry‚ p780-781) but the catalyst affects only the rate of reaction‚ and not the
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CULTURE AND CULTURAL ANALYSIS AS EXPERIMENTAL SYSTEMS In this weeks reading by Michael M.J. Fischer provides a spectrum of definitions of what culture embodies. Fischer also supplies a vast amount of examples that relate to various classifications of cultures. He describes “cultures as a methodological concept or tool of inquiry‚ might best be understood in terms of its historically layered growth of specifications and differentiations‚ refined into a series of “experimental systems” that‚ in
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Dr.Tawfeq al.Qaimare Rifqa Shawer Lab report 5 21-3-2013 Adsorption Chromatography Introduction: The technique of adsorption chromatography may be illustrated by a description of how two dyes are separated when a solution of the dyes is passed through a column of powdered silica contained in a vertical glass tube‚ it’s a method used to separate solids or liquids. At the first the two dyes are adsorbed at the top of the column‚ giving this region a nearly dark blue color. However‚ when
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Point 180°C) Rf value (cm/cm) 4.75/4.75=1 Absorbance at 449 nm 0.576 TABLE 3: Summary of Our Beta-carotene Sample Rf value (cm/cm) 4.75/4.75=1 Absorbance 0.186 Beers law determination of percent yield 0.00492 UV-vis spectra value Figure 1: TLC paper Figure 2: Beers law figure and calculations MEMORABLE OBSERVATIONS ANALYSIS Analysis (30): In comparison to last years percentage
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A&P 203- Study Guide (Review) for Practical #2 Blood Vessels 1. Identify Arteries and Veins on checklist on: Torso model Blood vessel Flat board 1/2-size Muscle Figure Arm and Leg models Life size Wall Chart. 2. Slides - Identify artery‚ vein‚ capillary and aorta. - Identify the three tunics (wall layers) in all vessels and the tissue that composes each tunic. Tunica interna (intima)- endothelium (simple squamous epithelium) Tunica media- smooth muscle Tunica externa
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5-dimethoxybenzene byFriedel-Crafts Alkylation of 1‚4-DimethoxybenzenePurpose1)To carry out the nitration of methyl benzoate‚ and then identify the major product formed (position at which nitro-group substitution takes place) by thin-layer chromatography (TLC)‚ the percent yield and the melting point range. 2)To synthesize 1‚4-Di-t-butyl-2‚5-dimethoxybenzene by Friedel-Crafts Alkylation of 1‚4-Dimethoxybenzene‚ and then determine the percent yield and melting point range. Procedure*Please refer to the
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INTRODUCTION Cassia fistula Linn. (Leguminosae) is a very common plant and is widely known for its medicinal properties. In the Indian literature‚ this plant has been described to be useful against skin diseases‚ liver troubles‚ tuberculous glands and its use in the treatment of rheumatism‚ hematemesis‚ pruritus‚ leucoderma‚ and diabetes.[1‚2] Besides‚ it has been found to exhibit anti-inflammatory and hypoglycemic activity and widely used as a mild laxative suitable for children and pregnant women
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PRE LAB REPORT Reynaldo Riboul TLC and Column Chromatography October 6‚ 2013 Table of Chemicals: Chemical Hazards Mol. Wt. Density Grams Moles Acetone Flammable‚ Irritant 58.08 g mol−1 0.791 g cm−3 2.0 g 0.0344 Hexane Flammable‚ Irritant‚ Dangerous to Environment 86.18 g mol−1 .6548 g mL−1 9.0 g 0.1044 Fluorene Very toxic to aquatic life with long lasting effects 166.223 g/mol 1.202 g/mL 0.3 g 0.00180 Fluorenone Irritant 180.20 g mol−1 1.13 g/cm3 0.3 g 0.00166
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Mn(acac)3 ‚Co(acac)3 and Cu(acac)3 was obtained at percentage yield of 32%‚ 85.6% & 92% for each of acac’s. TLC was performed which results deduced unknown mixture both contained manganese and cobalt since it had the same Rf vaues. Experiment aims The aim of the experiment was to prepare metal acetylacetonate complexes and also characterization by studying the (Thin Layer Chromatography (TLC) and reading IR spectra of the acetylacetonate complexes). Results and Discussion Table 1: The character
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