In the following reaction;
HCO3- (aq) + Hâ‚‚O(/)---> CO32- (aq) + H3O+ (aq)
HCO3 is a base and CO32- is its conjugate acid.
Hâ‚‚O is a base and CO32- is its conjugate acid.
HCO3 is a base and H3O+ is its conjugate acid.
Hâ‚‚O is a base and H3O* is its conjugate acid.