where kB is Boltzmann's constant, R is the gas constant, T is the temperature and h is Planck's constant. The rate constants indicate that at the neutral pH regime, dilute silicate concentrations and low salt concentrations, OSAZ is present as an isomer of H4SiO4 because equilibration achieves completion in most surface conditions. The rate constant corresponding to the forward reaction equation (A1) in table 1, with a free energy of 56.8 kJ/mol at 298K, is 677 s -1 indicating an equilibration time of 1.48 milliseconds. Likewise, the rate constant of the reverse reaction equation (A2) in table 1, with a free energy of 12.5 kJ/mol, is 4.04x10 10 s -1 , indicating and equilibration time of 2.47x10 -11 seconds. Rate constant calculations for the auto-ionization reactions, equations (B1) and (B2) in table 1, are of similar magnitudes and therefore the reaction completion times are also rapid.