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winter11_6

# winter11_6 - Conclusion of Project Werner What do these...

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Conclusion of Project Werner What do these analyses mean? Friday, February 18, 2011

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Titration In the Titration you added AgNO 3 to a solution containing your cobalt complex. The Ag + ionically bonded with the Cl - to form a solid, AgCl(s). You are measuring the amount of free, or ionic Cl - in your complex. Should reveal either 2 or 3 Cl - ions. Friday, February 18, 2011
UV-Vis Spectroscopy In this lab you: Decomposed your Co complex from [Co(NH 3 ) x L 1 L 2 ]Cl z (purple or orange) to CoCl 3 (blue) . Reacted it with sulfuric acid (H 2 SO 4 ) to form CoSO 4 •7H 2 O (red) Compare your solution of CoSO 4 to a standard curve of known concentration Friday, February 18, 2011

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Standard Curve Concentration Absorbance y = mx + b You obtain the concentration of your sample Friday, February 18, 2011
Derived Data Starting with CoSO 4 concentration From concentration moles CoSO 4 moles CoSO 4 = moles X 1/2 moles X 1/2 Molar Mass X 1/2 From here you can calculate any number of quantities Friday, February 18, 2011 You infer the concentration of your CoSO4 solution from the standard curve graph Because you made each solution 25 mL you can calculate the moles of CoSO4*7H2O, molarity is moles / liter. The number of moles of your Co has not changed therefore you can equate the number of moles calculated to the number of moles first decomposed on the hot plate. You measured the mass of each of those samples, therefore you can calculate the moles / gram, which is the molar mass or molecular mass (weight).

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Experiment 3 Ruthenium Bipyridine Friday, February 18, 2011
Laser Lab We will be skipping the synthesis portion of the lab We will dive right into the lab starting on page 48 This will take 1.5 lab periods Friday, February 18, 2011 The TAs and I have determined that the synthesis portion of the lab is not up to snu and we still need to work out some of the details because you can allow students to work through it.

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winter11_6 - Conclusion of Project Werner What do these...

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