The Spectrochemical Series

The Spectrochemical Series - 531.42 nm 478.32 nm 517 nm 545...

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The Spectrochemical Series By Jared Hartzman Lab Instructor: Andrei Albulescu December 5 th , 2008
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A. The purpose of this experiment was to determine the identities of each of the five cobalt complexes (Complexes A-E) as either: -, -, -, , Br Cl F H2O NH3 by examining the data measured in the experiment. B. In order to perform this experiment completely, the procedure was divided into two parts. 1. The first week’s procedure synthesized one of the two unknown cobalt complexes (Complex A or B) 2. The second week’s procedure purified the cobalt complex synthesized in week one’s experiment and measured the wavelengths of the maximum absorbance of the five cobalt complexes. C. The data collected in week two’s experiment and the spectrochemical series were used to determine the identity of each other the five cobalt complexes. Visible Absorbance Measurements Complex A Complex B Complex C Complex D Complex E Max Absorbance λ :
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Unformatted text preview: 531.42 nm 478.32 nm 517 nm 545 nm 492 nm Absorbance: .606 2.140 0.125 0.099 0.299 Color of solution: magenta orange light pink pink light pink The Spectrochemical Series-<-< -< < Br Cl F H2O NH3 Evaluation of Results: • Given that -Br will absorb the longest wavelength according to the spectrochemical series, -Br would be Complex D. And given that NH3 will absorb the shortest wavelength, NH3 would be Complex B. Therefore leaving Complexes A, C, and E which were also determined using the spectrochemical series. Complex A was -Cl , Complex C was -F and Complex E was determined as H2O . Final Conclusions: • In conclusion by using the data obtained in the second week’s experiment and the spectrochemical series the five cobalt complexes were determined as follows: 1. Complex A = -Cl 2. Complex B = NH3 3. Complex C = -F 4. Complex D = -Br 5. Complex E = H2O...
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