sodiumsulfate and evaporating it to dryness. The percentage yield was computed by getting theratio of the weight of the crude caffeine (residue) and weight of the tea leaves used. Thepercentage yield was 0.92. INTRODUCTION Extraction is a method of seperation in which a solid or solution is contacted with a liquid solvent (the two being mutually insoluble) to transfer one or more components into to the solvent. There are two main types of extraction in chemistry‚ namely: Liquid-liquid extraction or solvent
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Experiment #4A- A Separation and purification Scheme Amena Alkeswani‚ PHCC Dhanlal Murally‚ PHCC September 27‚ 2012 Abstract: There are millions of different organic compounds. Most of them are found in mixtures and in order to achieve a pure form they need to be separated‚ isolated‚ and purified. However‚ there are endless numbers of possible mixtures‚ which make it impossible to have a pre-designed procedure for every mixture. So chemists often have to make their own procedures. The purpose
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Discuss the contribution of Attachment Theory to the Social and Emotional development of young children. Introduction Child development is the changes which occur from birth untill puberty‚ in a biological‚ emotion and psychological sense. The events throughout this period plays a vital role in the behaviour and emotion of the child‚ therefore it is essential that the parents or parental figure acts appropriately around the child. Attachment can be defined as the affectional tie that a person
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All the reagents and solvents used for synthesizing the title compound were of Analar grade (Merck) and were used as such without further purification. The 2-naphthol derived Mannich base 1-((4-methylpiperazin-1-yl)(phenyl)methyl)naphthalen-2-ol (MPN) was synthesized according to the general procedure described in the literatures [13‚ 14]. The 2-naphthol (4.33 g‚ 0.03 mol) was dissolved in 30ml of ethanol and it was mixed with N-methylpiperizine (3.0 mL‚ 0.03 mol) by continuous stirrer at room
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cyanoacetate and corresponding aldehyde (gkharas/235_14F/235_14F_Lab_2.pdf). Objective: The objective of the work that was completed included; the scale-up double amounts of Butyl 2-Cyano-3-(3‚5-dichloro-phenyl)-2-propenoate synthesis‚ isolation‚ and purification of product of Butyl 2-Cyano-3-(3‚5-dichloro-phenyl)-2-propenoate. Experimental Materials: The chemicals used in this lab were supplied by Sigma-Aldrich. -Butyl cyanoacetate (project #131) -Aldehyde #131‚ 3‚5-Dichlorobenzaldehyde -Piperidine -Methanol
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Page 1. Introduction 3 2. PROCESSING TECHNIQUES FOR MAKING NANOFIBERS 3 2.1. DRAWING 3 2.2. TEMPLATE SYNTHESIS 4 2.3. PHASE SEPERATION 5 2.4. SELF ASSEMBLY 6 2.5. ELECTROSPINNING 6 3. APPLICATIONS OF NANOFIBERS
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patterns. (3) Strong Efficiency: It means that theprices of securities reflect all information regardless of whetheror not it is publicly available‚ including historical price andtrading patterns. Question 2) 1) Discuss the implications of the seperation of ownership and management Professional Managerial Skills * The growth of a company comes with the demand for different skills to manage the operations of the company‚ meaning that the owners of a company may not entirely have the necessary
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3. Isolation of Product – All other amounts specified in this section should be followed without doubling. 4. Isolation of Product – Substitute 1.0 mL of cold 3.0 M HCl for 1.0 mL of cold 0.1 M HCl. 5. Purification and Characterization – Will not obtain an NMR spectrum. Reaction Scheme: Data and Results: Compound MW (g/mol) Amount Mmol Mp (degrees C) Bp (degrees C) 4-tert-butylcylcohexane 154.25 103 mg 0.67 47 – 50 Methanol 32.04 100 µL 65 Sodium Borohydride reducing solution
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to establish its own low-cost airline had not worked out as the Express line had not properly been seperated from the Delta mainline and still was too intertwined with the mainline to be considered a successful subsidiary. The combination of poor seperation and unclear differentiation was the main problem facing Delta in this case‚ resulting in the introduction of Song to become competitive in the low-fare segment again. 2) From what the case describes‚ the overall guiding policy of Song seems to
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engineering techniques to maximize sustainability and energy efficiency. NAFDAC requirements for water packaging facility: Source of water; the sustainable source of water in the location of the site is preferably a borehole. Adequate water treatment and purification. Factory
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