Water in DATABASE:
The logK° values in Chemical Equilibrium Diagrams
are given for infinitely diluted aqueous solutions (zero
ionic strength).
However, water (H2O) might be needed as a component if you wish
to model ionic medium effects, especially on systems where minerals precipitate
involving H2O, such as gypsum
(CaSO4·2H2O).
Therefore it is recommended that
H2O is included in the database reactions.