Answers:
What are the conjugate bases of these acids?
| original acid | conjugate base |
| HNO3 | NO3- |
| H2O | OH- |
| H3O+ | H2O |
| H2SO4 | HSO4- |
| HBr | Br - |
| HCO3- | CO32- |
What are the conjugate acids of these bases?
| original base | conjugate acid |
| OH- | H2O |
| H2O | H3O+ |
| HCO3- | H2CO3 |
| SO42- | HSO4- |
| ClO4- | HClO4 |