Calculate the thiocyanate concentration at equilibrium if the irone (III) ion concentration is 0.23 M and the complex ion concentration is 0.625 M t equilibrium. Keq= 138M^-1
To calculate the thiocyanate concentration at equilibrium, we can use the equation that relates the concentrations of reactants and products to the equilibrium constant.
The balanced chemical equation for the reaction is:
Fe3+ + SCN- ⇌ Fe(SCN)2+
The equilibrium constant expression is defined as follows:
Keq = [Fe(SCN)2+] / ([Fe3+] * [SCN-])
Given that the concentration of Fe3+ is 0.23 M and the concentration of the complex ion (Fe(SCN)2+) is 0.625 M, we can substitute these values into the equation:
138 M^-1 = 0.625 M / (0.23 M * [SCN-])
Now, we can rearrange the equation to solve for the concentration of SCN-:
[SCN-] = 0.625 M / (138 M^-1 * 0.23 M)
Calculating this expression gives us:
[SCN-] ≈ 0.021 M
Therefore, the thiocyanate concentration at equilibrium is approximately 0.021 M.