249%‚ hydrogen contributed 9.701%‚ nitrogen contributed 8.843%‚ and carbon contributed 9.642%. Solubility is a chemical property referring to the ability for a given substance‚ the solute‚ to dissolve in a solvent. It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. It is important in predicting the parameters of the concentration of the drug in order to achieve the desired pharmacological
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whether is is Trimethylmethanol or 1‚2‚4‚5-Tetrachlorobenzene. Introduction Extraction is a process of transferring a solute from one solvent to another. It is usually used to separate one or more components from a mixture. Diethyl ether‚ dichloromethane (methylene chloride)‚ trichloromethane (chloroform)‚ pentane‚ hexane‚ petroleum ether are some of the solvents commonly used for extracting aqueous solutions. Petroleum ether and ligroin are mixtures of hydrocarbons whereas the other liquids mentioned
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expressed as an IC50 value‚ which is the concentration of the extract that scavenges 50% of the ABTS•+. The ABTS•+ scavenging abilities of the crude extract as well as the ethyl acetate fraction and its sub-fractions are presented in Table 2. For the solvent partitioned fraction‚ a similar trend to the DPPH• scavenging results was observed in the ABTS•+ scavenging activity‚ with the highest activity being found in the ethyl acetate fraction (IC50 = 61.0 _g/ml)‚ which was 3.7 times lower than those of
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concentration of 5 ppm‚ 1 ppm‚ 0.5 ppm and 0.1 ppm were made from stock solution. UV-Vis spectra of standard solution was recorded at 229 nm and equal to 0.544 AU. Vanillin was separated on SPE cartridges using a 50% methanol and 50% water as eluting solvent. UV-Vis of blank‚ 1 ppm and 0.1 ppm vanillin sample was obtained at 0.078 AU and 0.014 AU. 5 ppm solution of amlodipine besylate was made‚ its UV-Vis spectra were found to be 1.853 AU. Mixture of equal parts of amlodipine besylate and vanillin
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useful in the synthesis of a tertiary alcohol. Figure 1. General reaction mechanism of a Grignard Reaction The preparation of the Grignard reagent involves the adding of an alkyl halide to a suspension of magnesium metal in an anhydrous ether solvent through a radical mechanism. Side reactions include the slow reaction of the Grignard reagent with oxygen and carbon dioxide in the air‚ the reaction
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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 (TLC) and Melting point. Introduction: There are only
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Exp. 2A-D Solubility (pp.13-20) In this experiment‚ I will be determining/investigating the solubility of different solvents‚ or more precisely‚ the extent to which a substance is soluble or insoluble (Part A and B). Another goal of this experiment will be determining miscible (liquids that will mix homogeneously) and immiscible (liquids that do not mix homogeneously) parts in liquids (Part C). Part D of the experiment will be looking at solubility as well‚ the solubility of organic acids and
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confirm the presence of proteins‚ a simple visual check for color change is enough. EMULSION TEST FOR lIPIDS The lipids are a large and diverse group of naturally occurring organic compounds that are related by their solubility in nonpolar organic solvents The emulsion test is a method to determine the presence of lipids using wet chemistry. The procedure is for the sample to be suspended in ethanol‚ allowing lipids present to dissolve (lipids are soluble in alcohols). The liquid (alcohol with dissolved
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characteristic odor. It is available commercially with different K values. The K-value is an indication of the mean molecular weight which ranges from 2 to 3KDa for PVP-K12 and from 1000 to 1500KDa for PVP-K90 .It is Soluble in water and in polar solvents. Its insoluble in ethers‚ ketones‚ esters and hydrocarbons. Its glass transition temperature varries between 130-176ºC depending on the molecular weight (80). The water-soluble grades of polyvinylpyrrolidone are obtained by free-radical polymerization
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10/15/2012 Introduction: The purpose is to isolate caffeine from coffee by using the organic solvent dichloromethane (CH2Cl2) that is also referred to as direct contact. Calcium carbonate (CaCO3) is used to remove the tannins from the coffee. Afterwards an extraction is used to separate the organic layer (bottom) from the aqueous layer (upper). By using a rotary evaporator‚ it evaporates the organic solvent and forms the crude caffeine. Afterwards we used acetone-petroleum ether for recrystallization
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