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    Isolation‚ purification and characterization of alkaloid caffeine from tea leaves Date Submitted: September 3‚ 2014 Abstract Caffeine is one of the main constituents of tea leaves. In this experiment‚ 0.0039 g of pure caffeine was isolated from tea leaves. This was done through solid-liquid extraction followed by multiple liquid-liquid extraction. Then crude material obtained was then purified by sublimation. The isolated caffeine was subjected to thin layer chromatography (TLC) together

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    An Introduction to Qualitative Analysis Purpose:  Tests the ions of Mg2+‚ Ca2+‚ Sr2+‚ and Ba2+‚  and identify them separately. By using these  observations‚ identify the unknown ion. Then tests  the ions of SO42-‚ CO32-‚ Cl-‚ and I-‚identify them separately‚ and use the observation to identify the unknown.  Procedure Part I - Qualitative Analysis of Group 2 Elements  Mix 0.02M K2CrO4 with each Mg(NO3)2‚ Ca(NO3)2‚ Sr(NO3)2 and  Ba(NO3)2 together. Secondly‚ mix 0.1M (NH4)2C2O4 instead

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    Analysis of Silver in an Alloy Introduction In this experiment an alloy of silver will be analyzed to determine its silver content. The silver-copper alloy will be dissolved in nitric acid‚ the silver will be precipitated as silver chloride‚ and the silver chloride will be filtered‚ washed‚ dried and its mass determined. From the mass of the silver chloride formed and the mass of the original sample‚ you will be able to calculate the percent of silver in the alloy. Because the results are

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    Drying the organic solvent. The organic solvent containing the neutral compound contains some dissolved water. If the solvent were evaporated at this point‚ the resulting solid neutral compound would be wet with water and would consequently be a gooey mess and would take a long time to dry. A drying procedure is therefore necessary to remove all traces of water before the solvent is evaporated. This procedure consists of two steps: (1) thoroughly mixing the solution with saturated aqueous sodium

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    Identification and characterization of model drug 7.1.1 Description: A pale yellow‚ crystalline powder having bitter taste. 7.1.2 Melting point: The melting point of model drug was found to be 318ºC which confirmed the purity of model drug. 7.1.3 Solubility: Solubility of model drug in distilled water was found to be 10 mg/ml. 7.1.4 Ultraviolet spectrum: The λ max of model drug in 0.1N hydrochloric acid 278nm. Figure 7.1: UV Spectrum of model drug in 0.1 N HCl The λmax selected for the further analysis

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    Extraction of caffeine from Lipton tea leaves Maria Gianna Beatrice L. Cancio*‚ Joe Mari Isabella B. Caringal‚ Rowena A. Chiang‚ Patricia Deanne del Valle Department of Biological Sciences‚ College of Science‚ University of Santo Tomas‚ España‚ Manila‚ Philippines Abstract Caffeine was extracted from Lipton tea leaves by multiple extraction techniques namely solid to liquid extraction and liquid to liquid extraction; the purification by sublimation and melting point determination. Three

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    Substitution Reactions* INTRODUCTION In class‚ we have been learning about substitution reactions and the various mechanisms by which they can occur. In a substitution reaction‚ a leaving group‚ usually a halide‚ is replaced by a nucleophile. Two mechanisms have been described for this reaction‚ a unimolecular (SN1) mechanism‚ and a bimolecular (SN2) mechanism. The stepwise unimolecular mechanism proceeds through a carbocation intermediate. These reactions are favored by the use of a substrate

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    CHEM 1411 Laboratory Policies The goal of General Chemistry lab at UVA is to provide students an authentic science inquiry experience. The following sections detail the different components of the CHEM 1411 curriculum and the expectations for students in this course. The syllabus contains the semester schedule of what labs are completed when‚ and what is due each week at the beginning of lab. It is your responsibility to know what is due to your TA. If you have any questions about the course

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    around noon every day‚ worked until seven in the evening‚ and then went home to work some more. His computer system at home was connected on a dedicated private line to a system at Bell Labs‚ and he often worked at home until three in the morning. Even in the early 1990s‚ after he became a manager at Bell Labs‚ his work habits did not change substantially. "It still tends to be sort of late‚ but not quite that late‚" Ritchie told Patrick Moore in an interview. "It depends on what meetings and so

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    (Name) (Course Name) (Instructors Name) (Date) Summary of chemistry lab report Introduction The two factors which affect the yield of products in a chemical reaction is the amount of starting materials (reactants) and the percent yield of the reaction. Many experimental conditions for example temperature‚ and pressure can be adjusted to increase yield of the desired product‚ in chemical reaction‚ but because chemicals react according to fixed mole ratios( stoichometrically)‚ the only limited

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