A conjugate acid-base pair is 2 substances that differ by one hydrogen ion. A substance that can act as both an acid and a base is amphoteric. Weak acids ionize only slightly. Ionization constant for acids, Ka, is the ratio of the conc of the dissociated form of an acid to the undissociated form. If Ka is large, acid is strong.
Strong bases dissociate completely into metals ions and OH- in aqueous solns.
Weak bases do not completely dissociate in aqueous soln.