Question

An HNO3(aq) solution has a pH of 1.61. What is the molar concentration of the HNO3(aq) solution?

Answer 1

                PH   = 1.61

             -log[H+] = 1.61

                  [H+]   = 10^-1.61   

                 [H+]    = 0.0245M

               HNO3---------> H⁺   + NO3^-

              0.0245M         0.0245M

         [H+]   = [HNO3]

        [HNO3} = [H+]

         [HNO3]   = 0.0245M