Since FeSCN(2+) was generated by the reaction of Fe(3+) and SCN(1-),

the initial [Fe(3+)] and [SCN(1-)] are each diminished by the [FeSCN(2+)] formed,

that is, in each tube

[Fe(3+)]equil = [Fe(3+)]initial - [FeSCN(2+)]equilibrium         and

[KSCN]equil = [KSCN]initial - [FeSCN(2+)]equilibrium

Using the equilibrium concentrations of Fe(3+), SCN(1-), and FeSCN(2+), calculate Kc for each set of data and determine an average Kc.

Introduction to Equilibrium

Course Syllabus

Equilibrium Web Data Sheet