An acid reactant produces a base product and the two constitute an acid-base conjugate pair.
The Conjugate Acid-Base Pair
H2S + NH3 HS- + NH4+
H2S and HS- are a conjugate acid-base pair.
HS- is the conjugate base of the acid H2S.
NH3 and NH4+ are a conjugate acid-base pair.
NH4+ is the conjugate acid of the base NH3.
Every acid has a conjugate base, and every base has a conjugate acid.
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