Determination of Trace Amount of Copper and Zinc in an Aqueous Solution by Atomic Absorbance Spectroscopy Abstract: The purpose of this experiment is to analyze a sample containing copper and zinc in trace amounts‚ where standard addition method was used and the instrument used is the atomic absorbance spectroscopy. The amount of copper obtained was 0.569 ppm ± 0.015 and for zinc we obtained 0.42 ppm ± 0.0027. Introduction: This method implies the excitation of particles in the solution sample
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Microwave Synthesis of 5‚10‚15‚20- Tetraphenylporphyrin Abstract: In this green chemistry experiment of 5‚10‚15‚20-tetraphenylporphyrin was synthesized from benzaldehyde and pyrrole. using microwave irradiation to heat the reactants.‚ The liquid reactants are absorbed on a solid support‚ silica gel‚ which acts as a Lewis acid catalyst to facilitate the reaction. The reaction forms a porphyrinogen‚ which is then oxidized to the porphyrin product by atmospheric oxygen. Column chromatography is performed
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used in this part of the experiment to be able to separate the supernatant and the precipitate. And the supernatant will be used to test for the presence of Fe2+‚ Ag+ and Fe3+ in the solution. Results showed that there is a positive presence for FE 2+‚ Fe3+ and Ag+ because of the visible change of color of Prussian blue precipitate‚ blood red solution and white precipitate. The balance chemical equation for the reactions were Fe2+ + K3Fe(CN)6 - Fe(CN)36 +K2 +Fe ‚ Fe3+ + KCSN Fe(SCN)3+K and Ag+
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Kant’s Threefold Synthesis and Transcendental Unity of Apperception A large portion of Immanuel Kant’s Critique of Pure Reason concerns itself with explaining how humans are able to attain knowledge‚ especially empirical knowledge of the world. Addressing this question‚ Kant wrote: “We must enquire what are the a priori conditions on which the possibility of existence rests” (A95-96). After problematically deducing that all cognition of objects is limited by the objects’ physical appearances (A95)
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#1 Title: Synthesis of Divanillin Abstract: The purpose of this experiment was to synthesize divanillin. This was done via the oxidative dimerization of two equivalents of vanillin‚ using enzyme horseradish peroxidase as the catalyst. Procedure: Lab Handout: Nishimura‚ R.T.; Giammanco‚ C.H.; Vosburg‚ D.A. J. Chem Educ. 2010‚ 87‚ 526-527. Discussion: Mechanism: Reaction 2 Vanillin H2O2 Divanillin 2 H2O Molar Mass
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But sometimes just regular puberty can make your voice a little high. You would think that your voice gets deeper and deeper as you get older but sometimes it’s the other way around. 1. 1 computer (with internet access) 2.
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CHE 235 Lab 10/30/14 Scale-up Synthesis and Characterization of Butyl 2-Cyano-3-(3‚5-dichloro-phenyl)-2-propenoate‚ TSE Project #131 Introduction: This report describes the steps taken to create the scale-up of targeted trisubstituted ethylene‚ Butyl 2-Cyano-3-(3‚5-dichloro-phenyl)-2-propenoate compound (#131)‚ and also the characterization methods deployed to the results. This report serves as a critical step in the overall objective of the project; the synthesis of the copolymer. The overall
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1. 5 drops of benzaldehyde was dropped in test tube 2. 5 drops of acetophenone was dropped in test tube 3. 6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added to the solution in each test tube 1‚2 and 3. (concentrated sulfuric acid was very carefully handled because it was extremely corrosive and powerful oxidizing agent.) test tube 1‚ 2‚ 3 were observed if there were any chemical changes. Experiment 2 5 drops of 1-pentaol was dropped in test tube 4. 5
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synthesis http://www.iupui.edu/~cyber231/W131/synthesis_objective.html Project Three: Objective Synthesis Paper Overview│Assignment Guidelines │Prework│What ’s due with the draft │What ’s due with the essay │Assignment Resources │Syllabus Print these guidelines Overview View the instructor narrated PowerPoint explanation of Project Three While Project 2 focused on the rhetoric in one specific text‚ in Project 3‚ we will focus on comparing the ideas and issues raised by all the authors
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Laboratory Exercise #3 Measuring Protein in Solution Abstract The purpose of this lab was to learn about the Biuret assay reaction to determine if it can detect proteins and amino acids; also‚ to understand the process of “salting out” proteins and how to determine the amount of protein in a solution. In order to do so‚ egg white and ammonium sulfate were mixed on ice and then put into the centrifuge. After PBS was added‚ the amount of protein could then be determined. After that‚ 14 test tubes
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