I'll start you out on this.
FeCl3 looks like an ionic compound, made of Fe(3+) and 3 Cl(-) ions.
You can find the structure of salicylic acid on chemfinder.com. It's a phenyl ring
ortho- substituted with an acid group and a hydroxy group.
http://chemfinder.cambridgesoft.com
The reaction will take place with either the iron ion or the chlorine ion interacting with the acid group on the salicylic acid molecule. There are four atoms on the acid group: the carbon, the hydroxy oxygen, the double bonded oxygen, and the hydrogen. One of the ions will form a bond with one of the atoms in the acid group. Think about it for a bit.