skounave

Thanks, that helps a lot. Is there someplace that will tell me how the dissolution for calcite (or others) is written?

Many of the equilibrium constants in the thermo database at 25C are very different from literature values. Specifically, the Log K for calcite in thermo.dat is listed as 1.7130, but in all the literature I looked at the log K for calcite is given to be around -8.3 What am I missing?