Close Problem d Practice Problem 16.4.3O Calculate the pH of a weak acid solution (IHAlo 100.K). Calculate the pH of a 0.350 M aqueous solution of nitrous acid (HNO2 Ka-45x104) and the cquilibrium concentrations of the weak acid and its conjugate base. pH (HNO2 Jequilibrium INO: leqibrium Show Approach