Dear David Parkhurst,
In the PHREEQC database there is two equations for CaCO3:
Ca+2 + CO3-2 = CaCO3
log_k 3.224
Calcite
CaCO3 = CO3-2 + Ca+2
log_k -8.480
Which one of the equilibrium constants is used by PHREEQC to calculate the
solubility constant?
If both this constants are used doesn't the model became unstable.
Best Regards
Pedro Chambel Leitão
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