conjugate acid

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con·ju·gate ac·id

the protonated compound of two compounds that differ in structure only by the presence of the labile proton.
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References in periodicals archive ?
Each of the individual explanations could remind the student that the equilibrium process between the weak acid and its conjugate base is always happening, but at different positions.
We found that the students interviewed had difficulty in realizing that the graph of pH effect on Acid-Base Equilibria dealt with an acid and its conjugate base, rather than a reaction (such as a titration) between two separate species.
Under alkaline conditions of peroxide bleaching the perhydroxyl radical (pKa = 4.8) ionizes to produce its conjugate base superoxide anion (*).