Determination of Keq for FeSCN2+ Lab Explanation Video ... The reaction of iron (III), Fe 3+, with thiocyanate, SCN–, to yield the colored product, iron (III) thiocyanate, FeSCN 2+, will be studied and its equilibrium constant determined using a Vernier Spectrometer. This will require that first a graph that relates the concentration FeSCN2+to its i – [FeSCN 2+] eq. Substituting the relationship from equation 5 for [FeSCN2+] eq, gives the resulting equation 3+ 3+ eq i A [Fe ] = [Fe ] εb − (6) Similar statements may be made about the thiocyanate ion. Letting [SCN–] i represent the thiocyanate initially added to the system, then it can be written that [SCN–] i = [SCN –] eq ...

wavelength of maximum absorbance by FeSCN2+(aq) . One point is earned for the correct answer with justification. (b) A calibration plot for the concentration of FeSCN2+(aq) is prepared at the optimum wavelength. The data below give the absorbances measured for a set of solutions of known concentration of FeSCN2+(aq). Concentration (mol L−1)

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