Identify each substance as an acid or a base and write a chemical equation showing how it is an acid or a base according to the Arrhenius definition. You may need to use H2O as a reactant or product to balance the reaction.
a. HNO3 (aq)
b. NH4+1(aq)
c. KOH (aq)
d. HC2H3O2 (aq)