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Acid base pairs differing ONE proton (H+) are called conjugate acid-base pair.

Examples:

H3O+ and H2O

H2O and OH-

NH4+ and NH3

HBr and Br-

HNO2 and NO2-

H2SO4 and HSO4-

HSO4- and SO42-

HOCl and OCl-

(In order of 'acid and base' respectively)

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