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 calculate the value of Kc for this equilibrium reaction, you need to consider the concentration of each species at equilibrium. The formula you used to calculate Kc is incorrect.
The correct formula to calculate Kc is as follows:
Kc = [FeSCN^2+] / ([Fe^3+][SCN^-])
Based on your given values, you obtained a concentration of 6.5e-4 M for Fe^3+ and SCN^-, and 5.7e-5 M for FeSCN^2+. Plugging these values into the correct formula, your equation should be:
Kc = (5.7e-5 M) / [(6.5e-4 M) * (6.5e-4 M)] ≈ 1.665
Therefore, your value of Kc for this test tube is approximately 1.665.
Make sure to double-check your calculations to ensure accuracy.