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CHM 2046L Lab Report #9 - Determination of an Equilibrium...

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Determination of an Equilibrium Constant Using a Spectrophotometer Brett Larose Coworker: Adam CHM 2046L Section # 19 4/08/2009 Objectives
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The main purpose of this experiment is to study the chemical reaction of and to produce in aqueous solution. Another main objective is to measure concentrations of ions in a solution using a spectrophotometer, as well as determining the equilibrium constant of this reaction at a given temperature. Materials/Equipment Spectrophotometer Test tubes (7) Test tubes (5) Kimwipes Chemicals Used De-ionized water (DI ) KCN Procedure For Part 1 of the experiment, seven test tubes were cleaned and rinsed. Each test tube was labeled A1 through A7. Each test tube was filled with the corresponding solutions, as shown in Figure
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1 . Afterwards, the wavelength of the spectrophotometer was set to 450 nm. The spectrophotometer was calibrated, using A1 as the reference sample, or blank. The absorbance of solutions A1, A2, A3 and A4 were measured and recorded. The spectrophotometer was then calibrated again to ensure drift did not occur. The absorbance of solutions A5, A6 and A7 were then measured and recorded. The
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