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

Kc is not acually related to initial concentrations, but to the concentations in equilibrium

IF this is performed at constan Temperature (no data is shown)

Then, Kc is changing, which is NOT true

Kc is actually a CONSTANT of equilibrium in which temperature is constant and Kc relates species in equilibrium

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