Question

What are the conjugate acid and base of `NH_3`?

Answer 1

The conjugate acid of `NH_3` is `NH_4^+`, ammonium ion; the conjugate base is `NH_2^-`, amide ion.

Explanation:

The amide ion does not exist in aqueous solution. Nor does the imide ion, `NH^(2-)`, nor does azide ion, `N^(3-)` (which are the conjugate bases of which species?). In pure liquid ammonia these species might well exist.