Recrystallization and Melting Point Determination W. H. Bunnelle‚ L. A. Meyer‚ R. E. Glaser (Version 3) Introduction Consider what happens when a solid material is placed in a solvent in which it has a low solubility. Not much! A small fraction of the solid will dissolve‚ but the rest will just sit there. (Actually‚ it doesn’t just ’sit there’ since an equilibrium is in effect‚ with solid molecules going into solution‚ and an equivalent number of dissolved molecules reforming solid‚ but we
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Rgt/Pdt | Structure | Physical Properties | Hazards | acetone | | Physical State: LiquidAppearance: colorlessBoiling Point: 56.20CMelting Point: -95.30CDensity: 0.79 g/cm3 | Causes eye and skin irritation. May cause central nervous system depression. May cause liver and kidney damage. Causes respiratory tract irritation. Extremely flammable. | aniline | | Physical State: LiquidAppearance: oily - colorlessBoiling Point: 1840CMelting Point: -60CDensity: 1.0216 g/cm3 | Combustible. Hazardous in
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Introduction: The purpose of this experiment is to use sodium borohydride to reduce benzil. However‚ stereochemistry allows for five possible products. If only one carbonyl group is reduced during the reaction a racemic mixture of benzoin will be the product that is produced. After the first reduction a chiral center forms causing the second reduction to occur from only one side of the ketone. Depending on which side the second reduction take place there are three possible products including: a racemic
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Apple and Child Labor Rylee Foster Glenview Park Secondary School BTT 010/020 Ms. Raatzs January 22‚ 2013 Children and teenagers everyday are put into child labor‚ to make money for their families or pay back what their families borrowed. In this paper I will examine child labor around the world and why children need to be able to live without being put under such stress and poor living circumstances. I will also be talking about how child labor is involved in some electronic companies
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INTRODUCTION Chromolaena odorata is a scientific name for a type of weed. Commonly these weeds are called as Jack-in-the-bush‚ Siam weed‚ devil weed or triffids. This weed is native in America but it has been introduced to other parts of the world including Asia and sub-Saharan Africa (Omokhua‚ McGaw‚ Finnie & Van Staden‚ 2015). In Malaysia‚ this perennial herb is known as ‘Selaput Tunggal’ or ‘daun Kapal Terbang’. In the beginning‚ C. odorata is considered harmful because this plant is quite invasive
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Chem 21 Fall 2009 Experiment 9 — Recrystallization _____________________________________________________________________________ Pre-lab preparation. (1) Read the supplemental material from Zubrick‚ The Organic Chem Lab Survival Manual. (2) Draw the structure of acetanilide and report relevant physical data. Be sure to cite the source of the data. You should be able to figure out what’s relevant by reading the procedure. (3) Find and report the boiling points of the solvents you will be using
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In an industrial hydrodesulphurization unit‚ such as in a refinery‚ the hydrodesulphurization reaction takes place in a fixed-bed reactor at elevated temperatures ranging from 300 to 400 °C and elevated pressures ranging from 30 to 130 atmospheres of absolute pressure‚ typically in the presence of a catalyst consisting of an alumina base impregnated with cobalt and molybdenum (usually called a CoMo catalyst). • Occasionally‚ a combination of nickel and molybdenum (called NiMo) is used‚ in addition
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Nitration and Purification of Bromobenzene Abstract: An electrophilic aromatic substitution reaction was performed on bromobenzene with nitric acid producing both 2-bromonitrobenzene and 4-bromonitrobenzene. Products of the reaction were purified through multiple recrystallizations and column chromatography creating multiple crops of a yellow powder. The percent yield of products was determined to be 51%. The melting point of Crop 1 was found to be 110-115 °C‚ and Crop 2 was found to be 37-90
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formation of precipitates will be a function of the heats of hydration of the cations. Part B will examine the interactions of halogens with halides. The reactions will take place in water. Addition of another solvent‚ hexane‚ will allow you to monitor the reaction [(B) Why would hexane interact differently than water? How would each solvent interact with halogens? With halides?] By examining several such reactions one may get a feel for how variations in the halogen (or halide) affect reactivity
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Reagent/Product Structure Hazards First Aid acetone Causes skin and eye irritations‚ hazardous when ingested or inhaled. The substance is toxic to central nervous system (CNS). The substance may be toxic to kidneys‚ the reproductive system‚ liver‚ skin. Repeated or prolonged exposure to the substance can produce target organs damage. . aniline Hazardous in case of skin contact (irritant‚ permeator)‚ of eye contact (irritant)‚ of ingestion‚ of inhalation. Severe overexposure can result
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