CrCl3.6H2O
Contains primarily Cr(H2O)4Cl2+
On standing in solution, gives a mixture of:
- Cr(H2O)4Cl2+ (light green)
- Cr(H2O)5Cl2+ (dark green)
- Cr(H2O)63+ (blue-gray)
Can measure the ion charge by the behavior on an ion exchange column.
The mixture separates into colored bands on the column.