2CLabManual201303

You will compare the visible absorption spectra of

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Unformatted text preview: spectrophotometric portion of this experiment you will analyze trans[Co(en)2Cl2]Cl that you previously prepared and its acid catalyzed hydrolysis product, [Co(en)2(H2O)Cl]Cl2. You will compare the visible absorption spectra of the two cobalt complexes in aqueous solution, examine how their separate absorptions depend on the concentrations of the cobalt complex solutions, and use the combined absorptions to determine the concentrations of the two cobalt complexes in an aqueous mixture. A Brief Introduction to Spectrophotometry The use of spectral data to identify and quantify substances is fundamental to chemical analysis. You are already familiar with the absorption spectra that are produced when atoms of an element absorb photons of electromagnetic radiation of certain wavelengths and cause an electronic transition from lower to higher energy states. You learned in Chemistry 2A that each element has a characteristic absorption spectrum. Many substances absorb photons in the visible light region of elec...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.

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