[brooke627]

Assume that Beer s Law plot prepared by a student exhibited a slope of 1.88 x 10^3 Abs M^-1. The student then prepared an equilibrium mixture having initial concentration of Fe3+ and SCN- ions of 1.0 x 10^-3 M each. After performing a blank correction she observed an absorbance of 0.28 for the equilibrium mixture.
a. Estimate the equlibrium concentration of the FeSCN2+ ion in this equilibrium mixture.
b. Calculate the Keq value for this mixture.

I got keq = -47/25000, but I have no idea if that's correct. I really don't even know where to start on the equilibrium concentration. I thought it was the same as calculating kc.

[billnotgatez]

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[Borek]

This is about using Beer-Lambert law - you are given information, that allows you to calculate FeSCN^2- concentration from the results of measurement. Have you tried that?