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Unformatted text preview: Q5-R 11:30 1Dr. Woodward Chemistry 123 Sample Quiz 2 Spring 2007 Quiz 5 20 Minutes 1.The crystal field splitting for the octahedral complex ion [V(H2O)6]3+is 2.2 eV. (a) [4 points] At what wavelength would you expect to find the maximum in the absorption spectrum of this complex? 2.2 eV (1.602 1019J/1 eV) = 3.52 1019J E = hc/ = hc/E = hc/E = (6.626 1034J-s)(3.00 108m/s)/(3.52 1019J) = 5.64 107m = 564 nm (b) [4 points] Draw the crystal-field energy-level diagram and show the placement of the d-electrons? (c) [2 points] What would be the color of this complex (assume only one peak in the absorption spectrum)? The absorption maximum (564 nm) is in the yellow region, so the compound will be violet. (d) [2 points] Would you expect the absorption maximum of [VCl6]3to fall at a longer or at a shorter wavelength? According to the spectrochemical series Clis a weaker field ligand that H2O....
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