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Consider the pair of molecules HX and X⁻. HX can react to form X⁻, and vice versa, through an [[acid-base reaction]]. Thus, HX is the conjugate acid of X⁻ (and X⁻ is the conjugate base of HX.)

When a base receives a proton, it is called the '''conjugate acid''' of that base. For example, NH₄⁺ is the conjugate acid of NH₃. NH₄⁺ and NH₃ are a conjugate acid-base pair. One can be transformed into the other by undergoing a simple [[acid-base reaction]].

HX acts as an acid, with a strength inversely proportional to the strength of its conjugate base.

The conjugate acid acts as an acid, with a strength inversely proportional to the strength of its conjugate base. For example, since NH₃ is a weak base, NH₄⁺ is a fairly strong acid.

==See Also==

==See Also==