The best-known examples of Hydrate Isomerism or Solvate Isomerism type of isomerism occurs for chromium chloride “CrCl3.6H2O” which may contain 4, 5, (or) 6 coordinated water molecules.
- [Cr(H2O)4Cl2]Cl.2H2O – Bright green
Tetraaquadichlorochromium(III) chloride dihydrate
- [Cr(H2O)5Cl]Cl2.H2O – grey-green
Pentaaquachlorochromium(III) chloride monohydrate
- [Cr(H2O)6]Cl3 – Violet
These isomers have very different chemical properties and in reaction with AgNO3 to test for Cl- ions, would find 1,2, and 3 Cl- ions in solution respectively.