Nitric acid (hno3) is a strong acid that is completely ionized in aqueous solutions of concentrations ranging from 1% to 10% (1.50 m ). however, in more concentrated solutions, part of the nitric acid is present as un-ionized molecules of hno3. for example, in a 50% solution (7.50 m ) at 25°c, only 33% of the molecules of hno3 dissociate into h+ and no3–. what is the value of ka for hno3?