The displacement of the chemical equilibrium
Iron(III) and thiocyanate
Use ← et →
Potassium thiocyanate and iron(III) chloride
Solutions of potassium thiocyanate and iron(III) chloride
Complexation equilibrium by addition of the former reactants
Thiocyanatoiron(III) has a dark red color
Equilibrium iron(III)+thiocanate ↔ thiocyanatoiron(III) gradually diluted
Test tubes filled with the former most diluted solution
A) Initial solution in equilibrium
B) + KCl (equilibrium ←)
C) + KSCN (equilibrium →)
D) + FeCl3 (equilibrium →)
Potassium thiocyanate and iron(III) chloride
Adapted from a presentation of Mc. Leod
Here is an animation that interprets this equilibrium in a molecular perspective:
Reactant and product (hydrated)
Adapted from a presentation of "ESA Chemistry resources"