I completed a lab to find the determination of Kc. I have to find the concentrations of reactants at equilibrium using an ICE table. The equation that were are using is

Fe^3+(aq) + SCN^-(aq) -> Fe(SCN)^2+(aq)

I have to create 5 ICE tables because we used 5 different test tubes each with a different concentration of SCN. The values I already have so far are the initial concentrations of reactants and the concentration of products at equilibrium.

For the first table the initial value of Fe is 1.0M and SCN is 1.0M. The concentration of product at equilibrium is 5.7 X 1o^-5M.

I set up the first ICE table like this:

Equation: Fe^3+ SCN^- Fe(SCN)^2+

I 1.0M 1.0M 0
C -5.7e-5M -5.7e^-5 +5.7e^-5
E 0.99M 0.99M 5.7e^-5

So for the concentrations of reactants at equilibrium, Fe is 0.99M and SCN is 0.99M

Did I do this correctly?

Answered above.

Yes, you have set up the first ICE table correctly. To determine the concentrations of reactants at equilibrium, you followed the ICE (Initial, Change, Equilibrium) method.

In the initial row (I), you filled in the initial concentrations of Fe^3+ and SCN^-. In this case, both reactants had an initial concentration of 1.0M. The product, Fe(SCN)^2+, had an initial concentration of 0M since no reaction had occurred yet.

In the change row (C), you determined the change in concentration for each species by subtracting the equilibrium concentration from the initial concentration. In this case, the concentration of Fe^3+ decreased by 5.7e-5M, the concentration of SCN^- decreased by 5.7e-5M, and the concentration of Fe(SCN)^2+ increased by 5.7e-5M.

In the equilibrium row (E), you filled in the equilibrium concentrations by adding the changes to the initial concentrations. The equilibrium concentration of Fe^3+ is 0.99M (1.0M - 5.7e-5M), the equilibrium concentration of SCN^- is 0.99M (1.0M - 5.7e-5M), and the equilibrium concentration of Fe(SCN)^2+ is 5.7e-5M (0M + 5.7e-5M).

Therefore, you have correctly determined that the concentrations of Fe^3+ and SCN^- at equilibrium are both 0.99M based on the given initial and equilibrium concentrations.