Lab #8 - The Spectrochemical Series by Erin Samplin Lab...

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The Spectrochemical Series by Erin Samplin Lab Instructor: Xiaoxiao Li November 27, 2007
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Purpose In the first week of this experiment, your group is to synthesize one of two unknown cobalt complexes (Complex A or B). In the second week of this experiment, your group is to purify the cobalt complex synthesized in week one and measure the wavelengths of maximum absorbance of five cobalt complexes: the cobalt complex synthesized by your group (Complex A or B), the cobalt complex not synthesized by your group (Complex A or B), and three other cobalt complexes (Complexes C, D, and E) provided by your instructor. You are to use these data and the spectrochemical series to determine the identities of each of the five cobalt complexes. Results and Discussion Cobalt Complex B was synthesized during week 1. A 5 dram vial was placed in a beaker in an oven at 110º C at approximately 1:30 PM. It was removed at about 2:30 PM. Once cool, the mass of the vial was measured and recorded using an electron balance. Object Mass (grams) Empty vial 16.443 20.0 mL of acetone was measured using a graduated cylinder. It was placed in an ice water bath to chill. A wash-bottle of distilled water was also put in the ice water bath to chill. Approximately 4.0 grams of NH 4 Cl, measured on an electron balance, was mixed with 10.0 mL of distilled water, measured in a graduated cylinder, in a 50 mL beaker.
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