dissolves like”‚ fluorene dissolves with the non-polar heptane and the polar fluorenone dissolves in the polar ethyl acetate solvent. This phenomenon was illustrated in class before the experiment‚ when it was pointed out why water will not dissolve fluorene‚ fluorenone‚ or transstilbene as readily as a nonpolar solvent such as heptane or toluene‚ or a polar eluent such as ethyl acetate. Those solvents have a much more similar structure to the solutes‚ whereas water’s structure is much different‚ making
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Oxidation of an Alcohol: Oxidizing Methoxybenzyl Alcohol to Methoxybenzaldehyde Using Phase-Transfer Catalysis PURPOSE OF THE EXPERIMENT Oxidize methoxybenzyl alcohol to methoxybenzaldehyde‚ using sodium hypochlorite as the oxidizing agent and tetrabutylammonium hydrogen sulfate as the phase-transfer catalyst. Monitor the progress of the reaction by thin-layer chromatography. BACKGROUND REQUIRED You should be familiar with extraction‚ evaporation‚ and thin-layer chromatography techniques
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from the molecule by ionization: CH3CO2H → CH3CO2- + H+ Because of this release of the proton (H+)‚ acetic acid has acidic character. Acetic acid is a weak monoprotic acid. In aqueous solution‚ it has a pKa value of 4.75. Its conjugate base is acetate (CH3COO−). A 1.0 M solution (about the concentration of
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Introduction Metallic yarns or threads‚ in general‚ have been known for more than 3000 years. Gold and silver were hammered into extremely thin sheets‚ then cut into ribbons and worked into fabrics. These were the first ‘man made’ fibres‚ which came thousands of years before nylon or rayon. The Persians made fabulous carpets with gold thread and the Indians‚ ornamental sarees with it. The metal threads were twisted‚ doubled or wrapped around some other thread such as cotton. With the advancement
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ABSTRACT Purpose: To evaluate the antifungal and cytotoxicity activity of four medicinal plants like Mystroxylon aethiopicum‚ Lonchocarpus capassa‚ Albizia anthelmentica and Myrica salicifolia. Methods: Microdilution method and brine shrimp lethality test were employed to evaluate antifungal and cytotoxicity of plant extracts. Results: Lonchocarpus capassa leaf extracts exhibited antifungal activity against tested fungal strains with MIC range of 0.78 – 3.125 mg/mL with LCLA extract inhibiting C
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used to hold this extraction and 5 mL of ethyl acetate will be passed through SPE column‚ to obtain and remove the caffeine from the SPE column. A small one-armed Erlenmeyer flask containing 5 mL of ethyl acetate along with the compound caffeine‚ should be the result after using the SPE column
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Objective: Learning how to Prepare Buffers of Various pH levels and Preparation of Acetate Buffer. Introduction A buffer is a solution having the capacity to resist changes in pH levels. Mostly a buffer consists of a weak acid and a salt of strong base or a weak base and a conjugate salt of strong acid e.g. acetate buffer is the most common buffer in which equimolar mixture of acetic acid and sodium acetate solution is used. CH3COOH CH3 COO - + H+ CH3COONa CH3COO - + Na+ Buffers are
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The pH of various mixtures and find the dissociation constant of acetic acid Chemistry (HL) Research Question: To determine the pH of various mixtures of sodium acetate and acetic acid in an aqueous solution and hence to find the dissociation constant of the acetic acid. Background: The mixture of sodium acetate and acetic acid in aqueous solution is a buffer solution. Buffer solutions are the solutions which resist a sudden change in the pH due to addition of small amounts of strong acid or base
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Preparation of Synthetic Banana Oil September 20th‚ 2012 Purpose: The main purpose of this experiment was to synthesize banana oil (isopentyl acetate.) Ester are often prepared by the Fischer esterification method‚ which involves heating a carboxylic acid with an alcohol in the presence of an acid catalyst. Theory: Synthesize isopentyl acetate by combining isopentyl alcohol with acetic acid and sulfuric acid and then heating the reaction mixture under reflux for an hour. The alcohol is the
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Polish the zinc strip using steel wool and then determine its mass. Allow the strip to sit in lead acetate for approximately an hour and observe the changes in the zinc strip. The zinc starts to accumulate particulate matter (lead particles) on its surface. This is cause by the chemical reaction that occurs between the lead acetate and the zinc strip. The strip is then rinsed in water and acetate and then dried. The particles of lead are scraped off the strip and dried thoroughly and then weighed
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