HNO3 is a strong mono-protic acid. This means it fully ionises to NO3- and H+ Therefore the concentration of H+ =1.53×10-3 M pH = -log[H+] = -log(1.53×10-3 M) = 2.81 pH = 2.81 Solution HNO3 is a strong mono-protic acid. This means it fully ionises to NO3- and H+ Therefore the concentration of H+ =1.53×10-3 M pH = -log[H+] = -log(1.53×10-3 M) = 2.81 pH = 2.81.