# Is AlCl3 a lewis acid?

Dec 13, 2015

By definition, a Lewis acid is an electron pair acceptor. Much of the chemistry of aluminum features the filling of the $p$ shell by a pair of electrons that derive from a donor atom (a Lewis base):
$A l C {l}_{3} + C {l}^{-} \rightarrow A l C {l}_{4}^{-}$