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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.