Looking at Table 5 (data sheet), how is K c related to the initial concentration

Question

Looking at Table 5 (data sheet), how is Kc related to the initial concentrations ( [Fe3+]o and [SCN–]o)? Is it what you expected? (Explain briefly)

room temperature Concentrations at equilibrium Fe les Absorbance Initial cocentrations | (au) 0.200 0.001 0.001 0.001 0.001 0.00019 0.000398 0.000597 0.000796 0.000995 0.000199 0.0000821 0,000126 0.000165 1.87E-04 0.856 0.353 0.000918 0.000316 0.000874 0.00047 0.000835 0.000631 0.000813 0.000809 283 306 313 285 297 0.708 0,803 Average 22.1 degree c 0mL

Explanation / Answer

According to the experiment they are related as,
Fe3+ + SCN- <-----------> FeSCN2+
Kc = [FeSCN2+]eq / [Fe3+]eq [ SCN-]eq
but [Fe3+]eq = [Fe3+]o - [FeSCN2+]eq
[ SCN-]eq = [SCN-]o - [FeSCN2+]eq
Kc =  [FeSCN2+]eq / { [Fe3+]o - [FeSCN2+]eq } { [SCN-]o - [FeSCN2+]eq }

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