consider the reaction HC2H3O2(aq) +H2O(l)–>H3O+(aq)+C2H3O2 to the negative power(aq).which species is the ?

conjugate acid? A HC2H3O2(aq)

B. H2O(l)

C. H3O+(aq)

D. C2H3O2 to the negative

E. two of these

H3O+. H2O acts as a base on the left side of the equation, and its pair is H3O+. If the reaction were reversed the H3O+ would be the proton donor, making it the conjugate acid.
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CH3COOH is the conjugate acid to CH3COO-, which is therefore its conjugate base.

H3O+ is the conjugate acid to H2O