1. The conjugate base of H3O+:
2. What is the conjugate acid of C6H5NH2?
3. Which of the following is NOT a conjugate acid-base pair?
A. H2O, H3O+
B. Cl-1, HCl
C. SO42-, HSO41-
D. NO3–, HNO3
E. -OH, O2-
4. Identify each substance in the following reactions as an acid, a base, a conjugate base, or a conjugate acid.