The Spectrochemical Series Lab Conclusion

The Spectrochemical Series Lab Conclusion - [Co(NH 3 ) 5...

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Conclusion Complex B was synthesized and purified. The colors of all five cobalt complexes were observed in solution and a spectrometer was used to measure the wavelength of maximum absorbance for each. The inverse relationship of energy and wavelength was used to rank the complexes in terms of the differences in energy caused by the splitting of the d orbital degeneracy. Knowing that greater magnitudes of crystal field splitting are marked by higher difference in energy values, the given spectrochemical series could be used to identify the complexes. On the basis of the wavelengths of maximum absorbance obtained in this experiment, complexes A, B, C, D, and E were found to be
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Unformatted text preview: [Co(NH 3 ) 5 Cl] 2+ , [Co(NH 3 ) 5 NH 3 ] 3+ , [Co(NH 3 ) 5 H 2 O] 3+ , [Co(NH 3 ) 5 Br] 2+ , and [Co(NH 3 ) 5 F] 2+ , respectively. However, the fact that the complexes in solution had colors that differed from the colors suggested by their wavelengths of maximum absorbance shows the possibility of error being present. Also, varying readings for the wavelength of maximum absorbance for complex C suggests that complex C may be better described as having the identity assigned to complex E, and complex E may be better described as having the identity assigned to complex C....
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This note was uploaded on 01/31/2009 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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