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Unformatted text preview: Q5-R 11:30 1Dr. Woodward Chemistry 123 Sample Quiz 1 Spring 2007 Quiz 5 20 Minutes Name _____________________________________ Lab Inst. ___________ Two-Digit Section Number ___________ ALL WORK MUST BE SHOWN TO RECEIVE FULL CREDIT 1.The absorption maximum for the complex ion [Co(NH3)6]3+occurs at 470 nm. (a) [2 points] Predict the color of this complex. Orange(b) [2 points] If the cobalt ion adopts a low spin configuration draw the crystal-field energy-level diagram and show the placement of the d-electrons? (c) [4 points] Calculate the crystal field splitting energy, , in eV. E = hc/ = (6.626 1034J-s)(3.00 108m/s)/(470 109m) = 4.23 1019J E = (4.23 1019J) (1 eV/1.602 1019J) = 2.64 eV (d) [2 points] Would you expect the absorption maximum of [Co(H2O)6]3+to fall at a longer or at a shorter wavelength (assume low spin configuration is maintained)? According to the spectrochemical series H2O is a weaker field ligand that NH3....
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- Spring '08