Isolation of Caffeine from Tea (12A) Introduction When a person drinks tea or coffee‚ it is not pure caffeine. It also has other natural substances. The purpose of this lab was to isolate caffeine from tea leaves. The methylene chloride removed nearly pure caffeine from the basic tea solution. Caffeine is a white‚ crystalline‚ bitter alkaloid‚ C8H10N4O2 ‚ usually derived from coffee or tea. Caffeine is used in medicine chiefly as a nervous system stimulant. Caffeine is used by humans to ward off
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Michael Ames Ms. Martin IPS Per. 1 11-3-09 Sludge Lab Report A few weeks ago‚ I got a container full of “sludge”. I was asked to separate it into its four components and identify each one to help me better understand how to separate mixtures ad identify substances. My original sludge had a liquid on top and solid(s) on the bottom. The liquid was clear‚ and most of the solid was tan. There was a small layer of blackish/brownish particles in the middle of the tan solid. There were small yellow
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The purpose of this experiment was to isolate and purify cholesterol from egg yolks. Two hard boiled egg yolks were twice extracted with diethyl ether and methanol‚ with the filtrate collected via vacuum filtration. Potassium hydroxide pellets were added to the filtrate‚ the ether was distilled off‚ and the mixture was saponified by reflux. The crude cholesterol was isolated through a series of ether extractions and aqueous washes; then the ether was dried with MgSO4 and removed by rotary evaporation
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Methodology A. Synthesis of D-Arabino-Hexulose Phenylosazone In a 50 mL quick-fit round bottom flask with a reflux condenser‚ dissolve 10 g cane sugar in a mixture of 20 mL glacial acetic acid. Boil mixture for 30 minutes. Add the phenylhydrazine solution through the condenser. Remove from the hot plate. Rinse with 5 mL of 1:1 mixture of water and glacial acetic acid to complete the transfer of phenylhydrazine. When a yellow solid emerges‚ swirl the mixture. Wrap a dry cloth around the flask
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3/16 Chem 322 Friday Partition Coefficient (Extraction) Lab for Benzoic Acid Reaction Mechanism: Purpose: The purpose of this particular lab was to demonstrate the difference in separation of Benzoic acid in water and Dichloromethane. Also the difference in separation of Benzoic acid in bicarbonate and Dichloromethane. By calculating the partition coefficient for each of these separations‚ it became clear the differences in the separation of the aqueous and organic layers. Observations
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Soda Ash Analysis and Volumetric Analysis of a Carbonate-Bicarbonate Mixture De Guzman‚ Danica Justine R. Department of Chemical Engineering‚ Faculty of Engineering University of Santo Tomas Espana‚ Manila Abstract Titration is a laboratory method in which the endpoint of a reaction is determined quantitatively. In this experiment‚ the amount of soda ash present in a sample was determined and the alkalinity reported as it was titrated using HCl as the titrant. Also‚ the percentage
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The Stereochemistry of Bromine Addition: Bromination of trans-Cinnamic Acid Pitak Chuawong Objectives 1. To perform bromination of trans-‐cinnamic acid 2. To investigate stereochemistry of bromination reaction Introduction Alkenes undergo electrophilic addition to give alkyl halides. When bromine is used as a
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Fig. (3.12): Cylinders after being removed from the molds and curing Fig. (3.13): Cubes after being removed from the molds and curing Fig. (3.14): Prisms after being removed from the molds and curing 3.5.7. Preparation of specimen’s surface: The specimen’s surface is important since it has variable influences on mechanical properties. So the specimens were prepared to have a smooth and parallel bearing surface. These specimens were perpendicular to the axial load during all the tests‚ as
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Introduction : "Aromatic" and "aromatic compound" sidetrack here. For implications identified with odor‚ see fragrance compound. Two distinctive reverberation types of benzene (top) consolidate to create a normal structure (base) In natural science‚ the term aromaticity is utilized to depict a cyclic (ring-molded)‚ planar (level) particle that shows strange dependability when contrasted with other geometric or connective game plans of the same arrangement of iotas. As an aftereffect of their security
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Cartesian Diver Essay The Cartesian Diver is named after the French scientist Rene Descartes. This experiment is supposed to show buoyancy‚ density and different forms of matter at work‚ when demonstrated. To create the Cartesian Diver‚ you’ll simply need: • A empty plastic bottle • A plastic eye dropper • Water 1. Fill the bottle with water‚ but be cautious of spills. 2. Very carefully‚ drop the dropper inside the bottle. Then‚ seal the cap on very tightly. 3. Squeeze the bottle‚ but not too
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