Answer : The reactant acid and conjugate base in this reaction is, [tex]NH_4^[/tex] and [tex]NH_3[/tex].
Explanation :
Conjugate acid : A species that is formed by receiving of a proton [tex](H^+)[/tex] by a base is known as conjugate acid.
Conjugate base : A species that is formed by donating of a proton by an acid is known as conjugate base.
The given chemical reaction is,
[tex]CH_3COO^-+NH_4^+\rightleftharpoons CH_3COOH+NH_3[/tex]
In this reaction, [tex]CH_3COO^-[/tex](base) react with [tex]NH_4^[/tex](acid) to give [tex]CH_3COOH[/tex](conjugate acid) and [tex]NH_3[/tex](conjugate base).
Therefore, the reactant acid and conjugate base in this reaction is, [tex]NH_4^[/tex] and [tex]NH_3[/tex].
