By definition, the pair corresponding to the Brønsted-Lowry base is H₂O/H₃O⁺.
According to Brønsted-Lowry, acids and bases were defined in terms of the transfer of hydrogen ions, H+.
A compound that donates a proton to another compound is called a Brønsted-Lowry acid, and a compound that accepts a proton is called a Brønsted-Lowry base.
An acid-base reaction is, therefore, the transfer of a proton from a donor (acid) to an acceptor (base).
On the other hand, when an acid donates an H+, the resulting species is called the conjugate base of the acid because it reacts as a proton acceptor in the reverse reaction. Also, when a base accepts H+, it becomes its conjugated acid.
So, in this case, the pair corresponding to the Brønsted-Lowry base is H₂O/H₃O⁺.
Learn more:
