Question

Classify the following as lewis acid and base: NH4+ and NH3

Answer 1

NH3 cannot be a lewis acid because it also has a full octet, and a free lone pair of electrons. ... NH4+ cannot be a Lewis base (electron donor) because it does not have any free electrons to give up. Since H+ ion accepts electrons, it is a Lewis Acid. NH4+ is is neither an electron acceptor nor an electron donor.Mar 23, 2019

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Answer 2

$NH_3$ acts as lewis base

Explanation:

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

As $NH_4^+$ can not gain electrons as its octet is already complete. Thus it cannot act as lewis acid or base.

$NH_3$ acts as lewis base as it donates lone pair of electrons to electron deficient species.

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