Â
Fe3+(aq)Â Â Â Â Â Â Â Â Â Â Â Â
+Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
SCN−(aq)⇌                        Â
FeSCN2+(aq)
Initial                 1.1×10−3                           Â
 Â
8.2×10−4                                                      Â
0
Change           Â
-1.8×10−4   -1.8×10−4  Â
+1.8×10−4
At equilibrium   1.1×10−3 - 1.8×10−4
              Â
8.2×10−4 - 1.8×10−4
                Â
1.8×10−4  Â
Hence Kc = [FeSCN2+] / [Fe3+] [SCN−].
             Â
=  [1.8×10−4] / [0.00092] [0.00064]
            Â
Kc = 305.706
