Part 1: Solution Concentration Absorbance E6 Fe3+ 0.001 SCN FeSCN -x 0.0000 -x +x 0.001-x-x X 1 1.50 x 10-5 0 2 2.92 x 10-5 0.127 3 5.78 x 10-5 0.282 Part 2: 4 1.35 x 10+ 0.432 Solution Concentration Absorbance 5 1.65 x 10 0.576 1 6 1.66 x 10-6 0 1.98 x 10 0.710 2 3.69 x 105 0.078 El Fe SCN FeSCN²+ 0.001 0.001 0 -x -x +x 3 8.00 x 10-5 0.235 4 1.22 x 10+ 0.660 0.001 0.001 - xx 56 1.62 x 10 0.823 1.99 x 10 1.005
a) Compare your calculated Keq values for the equilibrium solutions you made and measured. Are they relatively close? Should they be?
b) Compare your average Keq at room temperature to the Keq you measured at elevated temperature. If there is a difference, do you think it is significant, and if so, in which direction has the reaction shifted at the higher temperature? Does this mean the reaction is endothermic or exothermic?
c)If the cuvettes are not wiped clean of smudges and fingerprints prior to measuring the absorbances in Part II, will the measured Keq be affected? If affected, will the measured Keq be higher or lower than the true Keq? Briefly justify your answer.
d) Is spectrophotometry a reasonable method for determining the concentration and equilibrium constants of coordination complexes? How certain of your results are you?
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