Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq)
From known initial concentrations of Fe3+(aq) and SCN-(aq), and a spectrophotometric determination of the concentration of FeSCN2+(aq) at equilibrium, calculate Keq for this reaction from the following data.
Initial Conditions: Mix 4.24 ml of 2.10 x 10 -3 M Fe(NO3)3(aq) solution with 4.66 ml of 2.50 x 10 -3 M KSCN(aq) solution in a graduated cylinder. Add water so the total volume of the solution is 10.00 ml.
Equilibrium Conditions: The equilibrium concentration of FeSCN 2+(aq) is found to be 2.27 x 10 -4 M from spectrophotometry.
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