Extraction of Caffeine from Tea Leaves using Dichloromethane (CH2Cl2) Abstract The extraction of caffeine (C8H10N402) was done in two parts. The first procedure used was solid-liquid extraction which was done by boiling the tea leaves in 100 ml. distilled water for 5-10 minutes. The filtrate was acquired and was extracted again by liquid-liquid extraction using dichloromethane (CH2Cl2). The combined DCM (CH2Cl2) was washed and dried to yield crude caffeine. The crude caffeine was purified by
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a lack of support within the family. In the story‚ Two Kinds by Amy Tan‚ there is a mother who motivates her daughter by making her participate in several trainings to enhance her skills. Amy is signed up for many practices and events that she does not want to do. However‚ throughout the story we see a dramatic change in Amy from being an obedient to defiant caused by her mother’s pressure to become someone who she was not. From the story we see countless bad parenting habits. The first habit that
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In the paperwork MGT 380 Week 1 Discussion 1 Implementing Change in Decision Making you will find a right solution on the following task: "After watching the Change is good movie clip‚ list three ways in which it can impact your leadership at work and two ways it can impact your leadership at home or in your personal life. What was the most important thing you learned from the clip? Respond substantively to two other learners." Business - Management Week One: Why Organizational Change?
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experiment‚ there was a total of 2.25g of caffeine (the net weight of the tea bag). After preparing the tea solution‚ extracting‚ drying and evaporating the weight of crude caffeine was .0321g‚ making the percent recovery before sublimation 1.43%. After sublimation the weight of pure caffeine was .0027g‚ making the percent recovery of caffeine after sublimation .12%. The percent recovery of caffeine is less in the second half of the experiment because the crude caffeine had some impurities in it which were
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Title: Caffeine: The pros and cons of consumption Specific Purpose: At the end of my speech‚ the audience will be educated on the what caffeine is and the advantages and disadvantages of caffeine consumption. Preview of Main Points: I will be explaining what caffeine is‚ the benefits and the effects it has on us. Introduction (Attention Getter) How many for you consume caffeine on a daily basis? (Central Idea (Introduce topic and relate it to your audience)) In an article from fda.gov
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Sublimation of Caffeine from Tea Leaves By: Ashley Barnes CH 236 – P8 Experiment 4 & 4.5 Due: 10/15/2014 Table 1. Table of Reagents Discussion The extraction yield refers to the percent of caffeine in the tea leaves at start of the extraction experiment. Tea leaves had 0.55 grams of mass per eight ounce serving. The weight of the extracted crude caffeine was 0.264 grams. Therefore‚ the extraction yield was 48%. This means that we pulled out almost half of the caffeine in tea leaves
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Asia Pacific Business‚ Ethics and Society Li- Ning: Weekly Country Analysis Report Even though Li-Ning is a well-known brand in China and recently debuted its flagship store at Orchard Ion this year‚ the brand name is still unfamiliar to many Singaporeans. There are a couple of reasons to that and we shall look into what are the reasons that might be impeding Li-Ning from becoming a well-known brand in Singapore‚ what Li-Ning is doing to become famous as well as recommendations to
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Introduction A. Attention Getter: If you drink some kind of caffeine on a daily basis or close to that often‚ please raise your hand. Those you without your hands raised make up a rare percentage of today’s Americans. An article published in the Chicago Tribune on October 19‚ 2011 by Julie Deardorff‚ stated that nearly 90% of Americans drink coffee on a regular basis. B. Relevance Statement: When asked if you drank coffee or another source of caffeine regularly‚ the majority of the class raised
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Anthropology and African Studies at the University of Basel in Switzerland. This publication was made possible through support provided by the United States Agency for International Development (USAID). The opinions expressed herein are those of the author(s) and do not necessarily reflect the views of USAID. © Legal Assistance Centre‚ 2008 4 Körner Street Windhoek P.O. Box 604 Windhoek Namibia 264-061-223356 264-061-234953 Email – info@lac.org.na Website – www.lac.org.na An Adobe Acrobat
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This experiment was designed in order to extract caffeine from coffee grounds. In order to do this‚ filtration and extraction techniques with solvents such as calcium carbonate‚ magnesium sulfate‚ and dichloromethane were used1. Decaffeination is something that’s used around the world‚ and there is much discussion on the different methods that can be used. In this case‚ using solvents and heat was the preferred method in order to extract the caffeine. Decaffeination is often used to in order to prevent
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