H2O + 0.7993 mM   CaCO3
+ 0.9176 mM   H2SO4
+ atmospheric CO2   (pCO2 = 3.408)

pH = 3.68

  (at 25 °C)
Electrical conductivity:   274.1 µS/cm   (info)
Ionic strength:   3.229 mmol/L   (info)
Alkalinity:   -0.237 meq/L   (info)
Total hardness:   1.599 meq/L   (info)
Carbonate hardness:   0.0 meq/L   (info)
Redox potential (Eh):   834 mV  

(NOTE: No   preselected minerals   precipitate.)


Elements   (in mM)

C(4) DIC 1.33e-02
Ca Ca 7.99e-01
S S 9.18e-01
S(6) Sulfate 9.18e-01
O(0) O(0) 2.14e-12

Aqueous Species   (in mM)

H+ 2.23e-01
OH- 5.07e-08
CO2 1.33e-02
HCO3- 2.99e-05
CO3-2 8.01e-12
Ca+2 7.25e-01
CaSO4 7.37e-02
CaCO3 5.99e-12
CaHSO4+ 9.66e-05
CaHCO3+ 2.17e-07
CaOH+ 4.77e-10
HSO4- 1.41e-02
SO4-2 8.30e-01
O2 1.07e-12

Minerals   (Ksp values)

Mineral Formula SI Saturation state
Calcite CaCO3 -8.97 under-saturated
Gypsum CaSO4:2H2O -1.85 under-saturated
Portlandite Ca(OH)2 -18.69 under-saturated
Aragonite CaCO3 -9.11 under-saturated
Vaterite CaCO3 -9.53 under-saturated
CaCO3(a) CaCO3 -11.05 under-saturated
Ikaite CaCO3:6H2O -10.82 under-saturated
Anhydrite CaSO4 -2.07 under-saturated
Sulfur S -81.40 under-saturated

Disclaimer:   The pH calculator has been tested with great care. Nevertheless, the results are provided without warranty.