Define a conjugate acid-base pair.

A conjugate acid-base pair consists of two species that differ by one proton (H⁺). The acid donates a proton, and the base accepts it. Example:

NH3 + H2O ⇔ NH4+ + OH¯

In the reaction. NH3 and NH4+ , form a conjugate pair, as do H2O and OH¯.

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