Spectrophotometric Methods: The Determination of Iron The goal of this laboratory experiment was the quantitative spectrophotometric determination of Fe (II) by using a calibration plot‚ which obeyed the Beer-Lambert Law. In order to determine the Fe (II) concentration‚ a series of solutions of known concentrations were made. The solutions were analyzed by the Ocean Optics spectrophotometer in order to determine their absorbance. The concentration of the unknown Fe (II) was determined by the “eye-ball”
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Chem 3418 Organic Chemistry Laboratory I Acid Base Review Definition In general‚ an acid is a substance that can donate a proton (H+) and a base is a substance that can accept a proton. Any proton in an organic molecule can potentially be donated. The most acidic proton in a molecule would be donated first. Any lone pair in an organic molecule can act as the proton acceptor. An acid (HA) reacts with a base (in this case H2O) to form the conjugate base of the acid (A-) and the conjugate acid of the
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Kathleen Kramas Cells and Heredity Lab Tuesday 2:00-4:50 22 OCTOBER 2012 Membrane Permeability Decreases as Molecular Size Increases Introduction: Red blood cells are vital to organisms functioning properly. They are microscopic cells that carry oxygen from the lungs to all the tissues throughout the body. Upon transporting oxygen‚ red blood cells also exports waste‚ such as carbon dioxide‚ to the lungs where it can be expelled. Red blood cells are made up of hemoglobin which is surrounded by a
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added to this tube. If a purple color showed‚ it would indicate there was protein in the test tube. In the third separation of this experiment‚ the hood in the lab was used. The curds were placed in a 100 mL beaker and extracted using 30 mL of ethyl acetate. The curds were crushed with a stirring rod. This extraction was then gravity filtered through a funnel fitted with the filter paper. A rubber policeman was used to scrape the beaker to get as much casein as possible. This casein was then put aside
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OF? 1. First‚ solvents are used to mix together all the ingredients in a nail polish to yield a uniform liquid product. a. The type and amount of solvent determines how thick a polish is and how long it takes to dry b. Most Common solvent- ethyl acetate. c. Ill talk more about what the solvent does in a few slides. d. See pic 2. Another ingredient are resins- a polymer material that holds the polish together‚ they are resistant to soap and water. a. There are two types: film forming and adhesive
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it comparison with literature though Melting point‚ TLC‚ IR‚ 1H and 13C NMR Abstract: The synthesis of the product: β-D-glucose pentaacetate is done though the acetylation using acetic anhydride with D-glucose with the help of sodium acetate. The recrystallization of the product is done though a polar solvent like water. The Result of this experiment has a percentage yield of 61% and analytical methods that are to detect the products are 1H NMR‚ 13 C NMR‚ COSY‚ FTIR (IR)‚ Thin Layer Chromatography
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implants. Some of these factors include the gender of the cattle‚ what breed the cattle are‚ what muscles are being affected‚ and the overall growth and development of the cattle. Starting with gender‚ heifers were experimented on using trenbolone acetate and estradiol on lean maturity‚
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Evaluation of the phytochemical composition and the anti-proliferative potential of seed extract of Dicerocaryum senecioides on Jurkat T cell lines By Humbulani Ronald Tshilongamulenzhe A Dissertation submitted to the Faculty of Science and Agriculture‚ Department of Biochemistry‚ Microbiology and Biotechnology‚ School of Molecular and Life Sciences in accordance with the requirements of the University of Limpopo for honours for the degree Bachelor of Science in Biochemistry UNIVERSITY OF LIMPOPO
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order to compensate for the lack of supply of food the farmers need to somehow make their animals grow faster. For the solution they introduced the use of hormones. These hormones include estradiol‚ progesterone‚ testosterone‚ zeranol‚ trenbolone acetate and melengesterol acestate. Some of these hormones are found naturally in humans and some are synthetic growth promoters. But‚ is it safe for these foods to be consumed by people; and do they have any effects on our bodies? First‚ let’s define
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(product) = 0.1573 g alcoholTheoretical yield = 0.3999 g vanillin x (154.17 g alcohol/152.15 g vanillin) = 0.4052gPercentage yield = (actual yield/theoretical yield) x 100%= 0.1573 g alcohol/ 0.4052 g alcohol = 38.8%Solvent system chosen = ethyl acetate and hexane in 9:1 ratioMelting point range of alcohol #1 = 108oC -109oCObservationWhen the NaOH was added to the aldehyde #1‚ the solution turned yellowish green. It took 10 minutes for the white solid NaBH4 to completely dissolve in the aldehyde
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