OH MY....where to start.....OK start with the statement of the problem:
It reads as: "A drop of potassium thiocyanate solution is added to a solution of iron (III) chloride"
FeCl3 + KSCN <-----> Fe(SCN)3 + KCl
So Balancing this yields:
And I have no idea what your teacher meant about # of ligands being 2 x 3 (the charge on thwe metal cation-Fe3+. She may have been tring to tell you that many transition metals form octahedral comlexes.....OK the cation...will have six ligands-attached....that gives the complex octahedral geometry.
But I do know this:
Depending on the nature of the ligand and metal cation, a variable number of ligands may attach to the metal cation to form what is called a coordination complex. The number of ligands attached to the metal cation is called the coordination number of the metal.
Coordination numbers can range from 1 to over 6. Common coordination numbers for many transition metal complexes are 4 or 6. An unknown number, referred to here as "x", of thiocyanate ions, SCN¯, form a coordination complex with the iron(III) ion, Fe3+, according to the reversible reaction: