The low stability of superoxide suggests that its concentration is unlikely to exceed the concentration of dissolved O2 in the electrolyte from which it is produced. Although O2 solubility is pH-dependent, we can estimate the superoxide and oxygen activity through Henry's Law where the Henry's Law Constant for O2 in water is 𝐻 𝑂 2 𝑎𝑞 = 1.3 x 10 -3 M atm -1 :