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Table 5

Gypsum solubility via NaCl molality, where ‘0’ corresponds to its solubility in pure water at 25 °C

NaCl, mol/LIon activity products (IAP)(CaCl+), mol/Llog SI
0.000031 0.01 (equilibr.) 
0.0000067 0.0006189 −0.67 (undesut.) 
0.0000044 0.001505 −0.89 (undesut.) 
0.0000035 0.006651 −1.02 (undesut.) 
NaCl, mol/LIon activity products (IAP)(CaCl+), mol/Llog SI
0.000031 0.01 (equilibr.) 
0.0000067 0.0006189 −0.67 (undesut.) 
0.0000044 0.001505 −0.89 (undesut.) 
0.0000035 0.006651 −1.02 (undesut.) 

The initial condition is equilibrium of gypsum with pure water.

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