Objective: The objective of this lab was to find and examine the viscosities of ideal and non-ideal solutions. The ideal being the toluene/p-xylene and the non-ideal being the methanol/water. The second objective of this lab was to investigate the temperature dependence of viscosity (Halpern‚ 17-1). Introduction: Viscosity is the resistance to flow of a certain fluid. In this experiment two solutions are used. According to the definition of viscosity mobile liquids have a relatively
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volume of acetic anhydride 1.00 mL Moles of acetic anhydride 0.0110 mol Initial volume of phosphoric acid 0.300 mL Initial moles of phosphoric acid 5.15*10^-3 mol Limiting reagent Ferrocene Moles of limiting reagent 1.21*10^-3 mol Final weight of product 0.288g Theoretical yield 29.49 Moles of product 3.73*10^-4 mol % yield 97% melting point (°C) of product 128°C -131°C Calculations: Moles of Ferrocene 0.225g * mol of ferrocene/186.0g = 1.21 *10^-3 Moles of acetic anhydride 1.0mL *1.08g/mL
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Ariza Yamashita Department of Biological Sciences‚ College of Science Group 11 Corresponding author: gerome_911@yahoo.com Abstract The purpose of this experiment was to synthesize isopentyl acetate via Fischer esterification reaction between acetic anhydride and isoamyl alcohol‚ using concentrated sulfuric acid as a catalyst. This reaction is characterized by the combining of an alcohol and an acid (with an acid catalyst) to yield and ester plus water. In order to accomplish this reaction‚ the reactants
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pamper herself. The last thing on her mind are the toxins that are in the actual nail polish. Little does she know‚ there are plenty of chemical compounds that are in each nail polish bottle‚ three of which are very toxic. They are formaldehyde‚ toluene‚ and dibutyl pthlate (DBP)-also known as the "toxic trio." These three toxins are in many famous nail polishes including the two leading brands‚ OPI and Essie. In 2006‚ a group of young women activists fought to eliminate the toxins‚ and they did
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the common ones: acid halides‚acid anhydrides‚ esters and amides.Carboxylic acids and their derivatives areusually seen in industrial processes and mostbiological pathways. Esters can be seen as fatsand within the cell membrane. Esters are alsopresent in pleasant smelling liquids that areresponsible with the fragrant odor of fruits andflowers. Amides are also present in animalprotein and also in industrial products such asnylon. Acid chlorides and acid anhydrides areused in the synthesis of carboxylic
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police (Gutman 576). Soon after this‚ Goring would appoint Rudolf Diels as executive director. Diels worked to give this force more power and eliminate their vulnerabilities. He did this by making and issuing laws that would get passed and approved‚ allowing the Gestapo to form and gain power. Diel’s first law gave him the authority of a police commissioner‚ his second made the secret force officially known as the Gestapo (Gutman 576). Diels allowed the Nazis to get the power that they would soon abuse
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Social Alchemy 2nd Quarter / SY 2012 – 2013 Eng’r. Josephine A. Ng CHM142L/B21 Concepcion‚ Jermin B. Group# 2 Experiment No. 1 ------------------------------------------------- MELTING POINT AND BOILING POINT OF ORGANIC COMPOUNDS ------------------------------------------------- ABSTRACT The melting point (MP) and the boiling point (BP) are probably the most widely used physical constant in the field of science. Determining the boiling point and the melting point of a compound helps you to characterize
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Acetylation of α-D- glucopyranose 1. Reagents (1)2.5g(0.014mol) powdered D-glucose (2)0.5g ZnCl2 (3)12.5ml acetic anhydride (4)Cold water (5)120ml Ice water (6)Methanol 2. Physical properties Compounds | M.W. g/mol | M.P.℃ | B.P.℃ | Density g/cm3 | D-glucose | 180.16 | 146 | - | 1.54 | ZnCl2 | 136.315 | 292 | 756 | 2.907 | Acetic anhydride | 102.9 | -73.1 | 139.8 | 1.082 | Methanol | 32.04 | -98~-97 | 64.7 | 0.7918 | α-D- glucopyranose | 390.34 | 109-112 | 452
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burns off and mostly only toluene remains. The microscale graph seems to be accurate because it shows the large jump where the cyclohexane is burned off. To view the apparatuses used in the experiment look at the attached pictures. To compare the simple and fractional distillation‚ our GC analysis shows the samples we submitted. The first samples of our simple distillation showed that 76.21 percent of the mixture was composed of cyclohexane and 23.36 percent was toluene. The first few drops of
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Nienhaus et al. Journal of Occupational Medicine and Toxicology 2014‚ 9:9 http://www.occup-med.com/content/9/1/9 REVIEW Open Access Tuberculosis in healthcare workers – a narrative review from a German perspective Albert Nienhaus1‚2*‚ Anja Schablon1‚ Alexandra M Preisser3‚ Felix C Ringshausen4 and Roland Diel5‚6 Abstract Introduction: Despite the decline of tuberculosis in the population at large‚ healthcare workers (HCW) are still at risk of infection. Methods: In a narrative review the TB risk
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