Chapter 16, Problem 43E

Consider the reaction:

$F{e}_3{}^{3+}(aq)+SC{N}^{-}(aq)\rightleftharpoons FeSC{N}^{2+}(aq)$

A solution is made containing an initial [Fe³⁺] of $1.0\times \text{1}{0}^{-3}$ M and an initial [SCN^-] of $8.0\times \text{1}{0}^{-4}$ M. At equilibrium, [FeSCN²⁺] = $1.7\times \text{1}{0}^{-4}$ M. Calculate the value of the equilibrium constant (K_c).