Introduction: The purpose of this lab was to learn how to use a spectrophotometer to measure the amount of light absorbed by different concentrations of salicylic acid‚ compare those concentrations to our unknown sample and to use the data collected to compile a graph showing the levels of absorbance of the different concentrations. Methods and materials: In this lab we used a spectrophotometer‚ a test tube filled with water to be used as a blank‚ six test tubes with different concentrations
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DEPARTMENT OF CHEMISTRY TITLE: ANALYSIS OF COPPER IN BRASS BY UV-VISIBLE SPECTROSCOPY NAME: OPOKU ERNEST DATE: 21ST JANUARY‚ 2014 Page 1 of 9 TITLE: ANALYSIS OF COPPER IN BRASS BY UV-VISIBLE SPECTROSCOPY AIMS AND OBJECTIVES: By the end of this experiment‚ the student should be able to demonstrate the following proficiencies: 1. To determine the percentage of copper in brass by UV-visible spectroscopy. 2. Properly calibrate and use a spectrophotometer. 3. Convert percent
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X-ray Absorption Spectroscopy X-ray absorption spectroscopy (XAS) techniques probe short- and medium-range order‚ yielding information on bond lengths‚ coordination numbers‚ local coordination geometry and the oxidation state of atoms for a wide range of solid and liquid systems. XAS experiments require an intense‚ tunable photon source only available at synchrotrons. Features • medium and high energy (from atomic number Z=20 upwards) XAS‚ XANES (x-ray absorption near-edge structure)
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Experiment 6 Infra-Red Spectroscopy of HCl and DCl gas Abstract Fourier-transform infrared spectroscopy has been very useful in helping scientists examining molecules of HCl and DCl. Because deuterium has a greater mass than hydrogen‚ the IR band shown for HCl is at a higher wavelength than DCl. The absorption of light in DCl was at lower frequency 1700-2200 cm-1 because D is bigger and heavier. That’s why the vibrations on the IR were shorter for DCl compared to HCl. The stretching of
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~ 10 cm-1. It can be divided into near-infrared region (12800 ~ 4000 cm-1)‚ mid-infrared region (4000 ~ 200 cm-1) and far-infrared region (50 ~ 1000 cm-1). scientists have established various ways to utilize infrared light. Infrared absorption spectroscopy is the method which scientists use to determine the structures of molecules with the molecules’ characteristic absorption of infrared radiation. Infrared spectrum is molecular vibrational spectrum. When exposed to infrared radiation‚ sample molecules
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Absorption Spectroscopy Abstract: Absorption spectroscopy validated Beer-Lambert’s Law‚ confirming Beer-Lambert’s Law was a successful method in determining the molar concentration of a sample within a composition that is unidentified. Absorption spectroscopy is used in order to determine the ε value; ε was calculated to be .0566. Introduction: The purpose of the Absorption Spectroscopy experiment is to evaluate the reliability and accuracy
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In 1928‚ Raman spectroscopy was introduced by Sir Chandrasekhara Venkata Raman an Indian Physicist‚ together with K. S. Krishnan. For this tremendous contribution in Physics‚ Sir C. V. Raman got Nobel prize in 1930. Write something about Raman signal‚ where does it come from? What are the implications of Raman? Raman is the inelastic scattering of light. The meaning of inelastic scattering is observable from the figure below. When an electron is excited by photons of applied light‚ it jumps from
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Composition in Minutes Know Your Particles particle ! Source ! source ? 4 Liquid Particle Explorer: Number Size‚ Composition in Minutes Particle Characterization in the Lab method light microscopy EDX analysis IR – microscopy RAMAN microscopy meaning colour + form e.g.: black fibres elements e.g.: 96% Fe‚ 4%Cr‚.. compounds e.g.: Teflon‚ PE‚ compounds e.g.: Teflon‚ PE‚ TiO2 5 time/particle 1-5 min 60-180 min 60-180 min 60-180 min Liquid Particle Explorer: Number Size
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The technique by the name of Raman Spectroscopy was used (2013). This method detects laser light allowing for investigators to analyze lipstick marks left at the crime scene (2013). “Analyzing lipstick traces can be used to establish physical contact between two individuals‚ such as a victim and a suspect” (2013). This advancement is significant because current lipstick tracing relies on destructive forensic techniques or human opinion (2013). “Raman spectroscopy is ideal as it can be performed
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Introduction Atomic Absorption Spectrometer (AAS) is an analytical equipment commonly used for the detection of heavy metals in particular sample. The first step to analysis in the AAS is the atomization of the desired element by converting it to a gaseous state. The atoms then absorb the energy emitted from the hollow cathode lamp corresponding to the desired element and a detector reads the signal and records the results. The results may be used quantitatively or qualitatively depending on the
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