Is H+ a lewis acid?

Jan 15, 2016

${H}^{+}$ is a Lewis acid in that it is an electron pair acceptor.

Explanation:

On the other hand, a Lewis base is an electron pair donor (e.g. $H {O}^{-}$).

The protium species accepts a pair of electrons from hydroxide in the aqueous acid base rxn:

${H}^{+} + H {O}^{-} \rightarrow {H}_{2} O \left(l\right)$

Which is the Lewis acid; which is the Lewis base?

Alternatively:

$A l C {l}_{3} \left(a q\right) + C {l}^{-} \rightarrow A l C {l}_{4}^{-}$

Which is the Lewis acid; which is the Lewis base?