HClO4 in aqueous medium ionizes as Hydrogen(+1)cation and Chlorate (-1) anion Molar conc of Hydrogen cation =.245 Molar conc of chlorate anion = .245 Solution HClO4 in aqueous medium ionizes as Hydrogen(+1)cation and Chlorate (-1) anion Molar conc of Hydrogen cation =.245 Molar conc of chlorate anion = .245.