Acid-base conjugate pair forms when the element donates a proton and another species acquires it. [tex]\rm H_{2}O[/tex] and [tex]\rm H_{3}O^{+}[/tex]are the base-conjugate acid pair.
Acids are the species or element and compounds that donates proton or hydrogen ions to form a conjugate base.
Bases are the elements or compounds that acquires protons or hydrogen ions and form a conjugate acid pair.
Conjugate acids and bases are the species or the products formed when the protons or hydrogen ions are increased or decreased in their chemical structures.
The reaction can be shown as,
[tex]\rm H_{2}PO_{4}^{-} + H_{2}O \leftrightarrows H_{3}O^{+} + HPO_{4}^{2-}[/tex]
From the reaction, it can be said that the water molecule acquired the hydrogen or the proton ions and the hydronium ion produced as a result is the conjugate acid of the water base.
Therefore, [tex]\rm H_{2}O[/tex]and [tex]\rm H_{3}O^{+}[/tex]are the base-conjugate acid pair.
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