Fe3+(aq)             +                SCN−(aq)⇌                          FeSCN2+(aq)

Initial                 1.1×10^{−3}                                8.2×10^{−4                                                      ÂÂ}  0

Change             -1.8×10^{−4  ÂÂ}  -1.8×10^{−4  ÂÂ}  +1.8×10^{−4}

At equilibrium    1.1×10^{−3} - 1.8×10−4                 8.2×10−4 - 1.8×10−4                   1.8×10^{−4  ÂÂ} 

Hence Kc = [FeSCN2+] / [Fe3+] [SCN−].

               =   [1.8×10−4] / [0.00092] [0.00064]

              Kc = 305.706