I need to calculate the valueof Kc for 5 test tubes for an experiment that I completed on determination of Kc.
The equation used was Fe^3+ + SCN^-= FeSCN^2+
After creating an ice table for the first test tube my values for Fe and SCN were 6.5e-4M and for FeSCN I got 5.7e-5M.
So for the value of Kc I did
5.7e-5M / (6.5e-4M)(6.5e-4M) = 134.75
Did I set this up correctly and does my Kc value look correct?
To determine if you set up the calculation correctly for Kc, let's review the equation and the steps involved.
The equation used in your experiment is Fe^3+ + SCN^- = FeSCN^2+. This is an example of a chemical equilibrium equation.
To calculate Kc, you need to determine the concentration of each species at equilibrium and plug those values into the equilibrium expression.
From the information you provided, the initial concentrations of Fe^3+ and SCN^- in the test tube were both 6.5e-4 M, and the equilibrium concentration of FeSCN^2+ is 5.7e-5 M.
Therefore, the setup for calculating Kc should be as follows:
Kc = [FeSCN^2+]/([Fe^3+][SCN^-])
Substituting the given equilibrium concentrations into the equation:
Kc = (5.7e-5 M) / ((6.5e-4 M)(6.5e-4 M))
Evaluating this expression:
Kc ≈ 0.135
Based on the values you provided, it appears that you set up the calculation correctly, and your calculated value of Kc is approximately 0.135.