Looking at Table 5 (data sheet), how is Kc related to the initial concentrations

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)

Table 5-Equilibrium constant, at room temperature Tube Absorbance (au) 5 0.895 0.522 2 0.616 0.748 4 1.030 Initial cocentrations [Fe' ISCN lo (M) 0.180 0.000200 0.00100 0.000400 0.00100 0.000600 0.000800 0.00100 0.00100 0.00100 Concentrations at equilibrium ISCN lea e leq (M 0.000200 0.000117 0.000883 0.000283 0.000138 0.000862 0.000462 0.000167 0.000833 0.000633 0.000230 0.000770 0.000770 Average (MT1) 466 345 317 388 379

Explanation / Answer

From the chart:

The more we add of SCN-, the less Kc value will form...

Fe is always constant, so Kc is not affected by Fe+3

A special note should be marked that addition of SCN- should not affect Kc

If this is at constant temperature

then

this is clearly an erroneous experiment, since Kc is, by definition, constant

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