# Number of hydrate isomers of CrCl3.6H2O

Assuming ocahedral complex, The answer should be 4 as there can be 0,1,2,3 Cl- inside the coordination sphere. But, in many places the case with 3 Cl inside the coordination sphere is not present, answer provided is 3.

Loong's answer says otherwise. Only this answer and another answer in a linked question acknowledge the existence of the 3 Cl form. Every other place simply states that only 3 forms have been experimentally discovered.

Also, in coordinatiom isomerism too, in the case where both spheres become uncharged is ignored.

What is the reason?

• I have a copy of 5th edition- J. D. Lee, which says that 3 isomers are known. These complexes are formed when $\ce{CrCl3}$ dissolves in water. Came across an article where it is written that: If diethyl ether is added to the solution then a fourth complex $\ce{[Cr(H2O)3Cl3]}$ can be formed (without the water of crystallization). – Apurvium Dec 20 '19 at 13:48