Solid KSCN was added to a 2.00 M Co2+ solution so that it was also initially 2.00

Question:

Solid KSCN was added to a 2.00 M Co2+ solution so that it was also initially 2.00 M SCN. These ions then reacted to give the complex ion Co(SCN)+, whose formation constant was 1.0 × 102. What is the concentration of Co2+(aq) at equilibrium? Be sure to check any simplifying assumption you make.