Five acid-base equilibria are shown below. In each equation the two reactants on the left side of the equilibrium are designated A & B; the two reactants on the right are designated C & D. In the first equation, the charges of ionic reactants are shown; for the other four reactions these charges are omitted. In the fifth equation, H2CO3 is reactant C and NH3 is D. NaCl is an inert product. A table of pKa values is provided at the bottom of the page.
For each equilibrium, three questions are posed:
Acid | HCl | H3O(+) | H3PO4 | HF | CH3CO2H | H2CO3 | H2S | NH4(+) | HCN | C6H5OH | H2O | (CH3)3COH | NH3 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
pKa | -7 | -1.7 | 2.2 7.2 12.3 | 3.2 | 4.7 | 6.4 10.3 | 7.0 | 9.2 | 9.3 | 10.0 | 15.7 | 19 | 34 |