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In the reaction Co3+(aq) + 6NH3(aq) = Co(NH3)63+(aq), Co3+ acts as the Lewis acid and NH3 acts as the Lewis base.
Here's why:
Lewis acid: A Lewis acid is an electron pair acceptor. In this case, Co3+ has an empty orbital, making it capable of accepting an electron pair from NH3.
Lewis base: A Lewis base is an electron pair donor. NH3 has a lone pair of electrons on its nitrogen atom, which it can donate to Co3+.