The conjugate acid is H2SeO4 and the conjugate base pairs in the reaction is H2O.
The full equation of the reaction is
H2SeO4 + H2O----- H3O^+(aq) + HSeO4
Conjugate base are those substance formed when an acid loses a hydrogen ion. Considered a base because it can gain a hydrogen ion to reform the acid.
The conjugate acid is the species that donate a proton to the conjugate base, hence H2SeO4 is the conjugate acid while H2O is the conjugate base because it accepts a proton from H2SeO4.
Thus we concluded that the conjugate acid is H2SeO4 and the conjugate base pairs in the reaction is H2O.
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