# Is there a change in hybridization of the Al atom in the reaction: AlCl_3 + Cl^(-) -> AlCl_4^-?

The aluminum species accepts electron density from the chloride ion, and can be described as $s {p}^{3}$ hybridized.
Before the reaction, the metal centre could be described as $s {p}^{2}$ hybridized, and trigonal planar in structure. Much of the chemistry of aluminum can be described in terms of the metal filling its vacant $p$ orbital to give a $s {p}^{3}$ description.
What is the new geometry about $A l$??