Why is AlCl3 an Arrhenius Acid, while BCl3 is not?

Question

How can I determine which is an Arrhenius Acid?

Answer 1

I believe that is based on the release of a hydrogen ion from Al(H2O)6^3+ ==> Al(H2O)5(OH^-)^2+ + H^+.
BCl3 is not hydrated as the Al ion is.