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Truong-Son N. · Nathan L.
Aug 4, 2017

Yes. "AlCl"_3AlCl3 is a Lewis acid, as it accepts an electron pair into its central empty 3p_z3pz nonbonding orbital when making a bond, but does not directly donate a proton as a result.

The "BX"_3BX3 compounds are analogous and also Lewis acids:

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Lewis acids just have to accept an electron pair in a reaction to qualify. Brønsted-Lowry acids must donate a proton as a result of that electron acceptance for the Lewis acid to also be a Brønsted acid.

So, many Brønsted acids are also Lewis acids, or contain Lewis acids on them.

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