Suppose that some fescn2+ is added to the above solution to shift the equilibrium. when equilibrium is re-established, the following concentrations are found.
a) [fe3+ ] = 8.12 ✕ 10−3 m,
b) [scn − ] = 7.84 ✕ 10−3 m
what is the concentration of fescn2+ in the new equilibrium mixture?
hint: use your value of k to solve for the unknown concentration.

Explanation:

The given reaction equation will be as follows.

Let is assume that at equilibrium the concentrations of given species are as follows.

        M

        M

        M

Now, first calculate the value of as follows.

              =

              =

Now, according to the concentration values at the re-established equilibrium the value for will be calculated as follows.

          M

Thus, we can conclude that the concentration of in the new equilibrium mixture is M.