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Chem 15 Lab 7 Formal writeup

Chem 15 Lab 7 Formal writeup - Tien Wei(Tom Lee SID...

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Tien Wei (Tom) Lee SID: 21846711 Chem 15 Lab Lab Section 101 GSI: Jamie Kulp Lab Partner: Yun Liang Experiment 7 Quantitative analysis of a solution containing Cobalt and Copper Abstract: This three part experiment first used the ion exchange chromatography purification technique to separate out Copper (II) and Cobalt (II) from the unknown solution, then used back titration laboratory technique to determine the concentration of the Cobalt ions in the unknown solution, and lastly used flame atomic absorption spectroscopy to determine the concentration of the Copper ions in the unknown solution. For part two of the experiment, the calculated standard deviation for the concentration of Cobalt ions in the unknown solution was 0.00363. The 95% confidence interval obtained for the concentration of the Cobalt ions in the unknown solution was 0.0296 ± 0.00903 molarity. This confidence interval means that there is a 95% chance that the true concentration of the Cobalt ions in the unknown solution lies in this interval. For part three of the experiment, the slope (εb) for the standard copper solutions at 324.7 nm wavelength is 0.051. The standard deviation for the concentration of Copper ions in the unknown solution was calculated to be 1814. The 95% confidence interval obtained for the concentration of the Copper ions in the unknown solution was 14410 ± 4506.0042 ppm. This confidence interval means that there is a 95%
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chance that the true concentration of the Copper ions in the unknown solution lies in this interval. Purpose: The purpose of this experiment is to first separate out Copper (II) and Cobalt (II) from the unknown solution using anion exchange chromatography. Then determine the concentration of Cobalt (II) ions in the unknown solution using back titration with EDTA. And lastly, figure out the concentration of Copper (II) ions in the unknown solution using atomic absorption spectroscopy. Theory and Methods: This three part experiment uses the following laboratory techniques, in order, to achieve the purpose stated above: ion exchange chromatography, back titration, and flame atomic absorption spectroscopy. The first part of this experiment used the purification technique called Ion Exchange Chromotography. The reasoning behind this method is that the insoluable materials in the ion exchange resin contain anions that can be exchanged. In theory, the mobile phase is generally a low to medium conductivity solution. The adsorption of the molecules to the column material is driven by the ionic interaction between the oppositely charged ionic groups in the sample molecule and in the functional ligand on the column. The strength of the interaction is determined by the number and
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