Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvent such as benzene. When dissolved in water it gives:
[Al(H2O)6]3+ + 3Cl–
Solution: AlCl3 is hydrated in water after dissociation into ions as it behaves as an ionic compound. The interaction can be shown as:
AlCl3+6H2O→[Al(H2O)6]3++3Cl−