Use the following information to answer the next two questions. NH4+(aq) + H2O(l) → H3O+(aq) + NH3(aq) In a system at equilibrium, the concentration of the NH3(m) is 0.35 mol/L and the concentration of the NH4+(aq) is 0.25 mol/L. The pH of the NH4+(aq)/NH3(aq) solution is (4 mark)