Determining the unknown concentration of HCl via heat of neutralization of a reaction involving strong electrolytes and weak electrolytes. Myeongwon Lee 20522885 Partner: Frank Wong TA: Afsoon CHEM 120L – Earth Science & Chem 149 Section: 004 Tuesday‚ November 26th‚ 2013 Introduction All chemical changes are accompanied by change in energy and this energy is in form of heat. The energy change of a reaction that happens at constant pressure is defined as heat of reaction or enthalpy change and the
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Determine the concentration of an unknown copper (II) sulfate solution by using colorimeter Introduction: The concentration of the solution also alterations the proximity of the solution. For example‚ the more focused concentration will frame to be denser than more weakened concentration of copper (ii) sulfate. This implies there is a connection between the concentration of an solution and its absorbance. Along these lines‚ this test is set up to discover the kind of connection between the concentration
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DISCUSSION: Qualitative analysis is used to determine the presence of cations or anions present within a sample and their impurities. Information known‚ such as chemical and physical properties‚ about cations and anions can be used to determine what steps should be used to separate the sample into one‚ specific ion. Qualitative analysis involves forming and decomposing complex ions. Qualitative tests are very sensitive‚ allowing to detect a very small amount present in sample. Due to sensitivity
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Thin Layer Chromatography of the Unknown Analgesic Jessica Bajao*‚ Phoebe Abalos‚ Kevin Antiga‚ Carmelus Aseneta 3-Biology 2 College of Science‚ University of Santo Tomas‚ Manila‚ Philippines Abstract The group used five different analgesics in this experiment: aspirin‚ acetaminophen‚ ibuprofen‚ caffeine‚ and mefenamic acid. Six analgesics were spotted on the TLC plate including the unknown. After the development of the TLC plate‚ it was placed under ultraviolet light for the spots resulted
Free Chromatography Thin layer chromatography
Introduction The purpose of this lab was to explore the properties of an unknown compound. An unknown was given and a cation flame test and anion test was performed to determine the identity of the compound. Once the identity was determined‚ the properties were explored. Experimental To determine the cation of the compound‚ a cation flame test was performed. A bunsen burner was lit until a medium blue flame was burning. The given unknown was scooped onto a nichrome wire loop. The wire was held in the flame
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POS420: DQ’s for Week 1 Discussion Question 1 - Week 1 (Saturday): How old of an operating system is Unix? The story of how UNIX came to be is a long‚ but interesting tale. During the mid-1960’s‚ the first multi-user operating system called Compatible Time-Sharing System (CTSS) was created by Fernando Corbato at the MIT Computation Center. Although CTSS was highly influential for its time‚ it eventually failed‚ but not before a second generation operating system called Multiplexed
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Discussion & Error Analysis: By examining the unknown alcohol’s H NMR spectra‚ it can be deduced that the alcohol is 1-(3-methoxyphenyl)ethanol. There are three peaks that have a shift of ~7.0-7.5‚ one with integration values of 1‚ 2‚ and 1.This shows that the alcohol is a meta-substituted benzene ring. The singlet peak with a chemical shift of~ 4.7 ppm with an integration of 1 is from the hydrogen on the OH group. The peak at ~ 1.7 ppm corresponds to the hydrogen of the carbon that is attached
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account of the American Revolution‚ muddling and radicalizing its center story as "a people’s upset‚ a change among the most heterogeneous individuals to be discovered anyplace along the Atlantic in the eighteenth century." The characters in The Unknown American Revolution "looked toward a redistribution of political‚ social‚ and religious power; the disposing of old organizations and the production of new ones; the toppling of instilled examples of preservationist‚ elitist thought; the leveling
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Discussion. 1. When we want to measure voltage reading‚ the multimeter must be parallel with the component that we want to measured. The red on the high voltage side‚ and black on the lower. When measuring current‚ amperes‚ the multimeter must be in series with the component. Remove one side of the component and connect the black multimeter lead to the board where the component was plugged in and the red lead connects to the loose component. The difference between the two is that if we measure
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Identifying an Unknown Aldehyde or Ketone Introduction The purpose of this lab is to identify an unknown aldehyde or ketone substance using chemical tests. The chemical tests used in this experiment are solubility‚ Schiff‚ Bisulfite‚ and Iodoform tests. Also‚ a 2‚4-dinitrophenylhydrazone derivative synthesis reaction will be completed from which a melting point will be obtained. The chemical test results and the melting point analysis will be compared to the table of compounds given to find the
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