Experiment 7a Name: Date: Title: Purity of Aspirin by Spectrophotometry Aim: i. To measure the absorbance of different volumes of sodium salicylate solutions and aspirin with iron chloride ii. To find the concentration of each standard solutions iii. To determine percentage purity of aspirin. Abstract: The mass of acetylsalicylic acid was determined using a analytical balance. Sodium hydroxide (NaOH) was added to the acetylsalicylic acid and heated in order to hydrolyze acetylsalicylic
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Written report discussing the purity of my aspirin sample I produced. When I carried out the experiment to produce an aspirin sample I had to take a few results I had gained from carrying out the experiment later used these to work out the experimental error and percentage % yield. The results I used where the published value of what temperature pure aspirin melts at‚ the temperature my aspirin sample melted at‚ the weight of pure aspirin and the weight of impure aspirin. Firstly I worked out the
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Investigating Aspirin Aims Synthesize my own aspirin Analyse the purity of my aspirin samples (aspirin and recrystallized aspirin) compared to commercial aspirin by use of analysing melting points‚ TLC plates and colorimetry tests Investigate how pH effects the rate of hydrolysis of aspirin Background theory Making my own sample of Salicylic acid (to then be converted into Aspirin) Salicylic acid (2-Hydroxybenzoic acid) can be made by hydrolysing methyl 2-hydroxybenzoate. Oil
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Purity of Aspirin Objectives - To research‚ using various sources‚ the history of aspirin‚ its use in medicine‚ methods of synthesizing it and of measuring its purity - To compare the % purity of a branded aspirin tablet with a generic aspirin tablet - To compare 2 methods of composition analysis of the two types of aspirin Research
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Chapter 2 Basis of Derivative Spectrophotometry 2.1 The Main Law of Light Absorption by a Substance Photobiological processes occur under the influence of light of ultraviolet (UV)‚ visible‚ and near infrared spectral regions. Generally‚ values of light flux intensity‚ I‚ and wavelength‚ l are used in optical measurements. The frequency index n is also considered to characterize an absorbed light. Frequency is expressed in reciprocal seconds [cÀ1] and presents itself as the ratio
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interaction of electromagnetic radiation with chemical compounds (Stewart & Ebel‚ 2000). By using spectrophotometric analysis or spectrophotometry‚ one can determine the identity in terms of structure and species of a biomolecule as well as establish the concentration of a certain biomolecule (Stewart & Ebel‚ 2000). Absorption spectrophotometry is the most common of spectrophotometry technique used by biochemist. The science behind this technique is when light passes through a solution‚ components or substances
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SPECTROPHOTOMETRY Herman‚ Harmon Chris T. 1Prof. Meynard Austria‚ of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology‚ Chm171L/A1‚ School of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology‚ Experiment # 4 [pic] ABSTRACT The objectives of this experiment are to examine the components of a simple spectrophotometer- the Jenway 6100 & Perkin Elmer Lambda 40. As well as to determine the absorption spectrum of a solution
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against the absorbance and was found to be Introduction Spectrophotometry is a method to measure how much a chemical substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution. The basic principle is that each compound absorbs or transmits light over a certain range of wavelength. This measurement can also be used to measure the amount of a known chemical substance. Spectrophotometry is one of the most useful methods of quantitative analysis in
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POTENTIOMETRIC DETERMINATION OF THE PURITY AND DSSOCIATION CONSTANT OF HYDROGEN PHTHALATE Department of Chemical Engineering‚ College of Engineering University of the Philippines‚ Diliman‚ Quezon City‚ Philippines Date Due: September 20‚ 2013 Date Submitted: September 20‚ 2013 RESULTS AND DISCUSSION An experiment was conducted to determine the purity of Hydrogen Phthalate sample and its dissociation constant. To perform the experiment with the utmost precision‚ equivalence point was
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Spectrophotometry was used in the lab to determine whether non-magnetized zeolite‚ magnetized zeolite‚ or charcoal was the more effective sequestration agent for Procion Red Dye. A calibration curve was created with the known concentrations and the absorbances of the Procion Red Dye dilutions at λmax. The slope of the calibration curve was used to determine the concentration of the analytes. As a result‚ charcoal was shown to be the more effective sequestration agent. Introduction PAHs‚ polycyclic
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