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

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

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

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==