H2O + 1.0 mM   Na2SO4
+ 1.0 mM   CO2
+ 1.0 mM   NH3
+ atmospheric CO2   (pCO2 = 3.408)

pH = 8.16

  (at 25 °C)
Electrical conductivity:   342.9 µS/cm   (info)
Ionic strength:   3.903 mmol/L   (info)
Alkalinity:   1.0 meq/L   (info)
Total hardness:   0.0 meq/L   (info)
Carbonate hardness:   1.0 meq/L   (info)
Redox potential (Eh):   575 mV  

(NOTE: No   preselected minerals   precipitate.)


Elements   (in mM)

C(4) DIC 9.33e-01
Na Na 2.00e+00
S S 1.00e+00
S(6) Sulfate 1.00e+00
Amm Ammonium 1.00e+00
O(0) O(0) 5.11e-12

Aqueous Species   (in mM)

H+ 7.38e-06
OH- 1.55e-03
CO2 1.33e-02
HCO3- 9.11e-01
CO3-2 7.51e-03
NaOH 4.78e-07
Na+ 1.99e+00
NaHCO3 8.93e-04
NaCO3- 2.14e-04
NaSO4- 7.51e-03
NH4+ 9.20e-01
NH3 7.07e-02
NH4SO4- 8.92e-03
HSO4- 5.43e-07
SO4-2 9.84e-01
O2 2.55e-12

Minerals   (Ksp values)

Mineral Formula SI Saturation state
Thenardite Na2SO4 -8.23 under-saturated
Mirabilite Na2SO4:10H2O -7.43 under-saturated
Nahcolite NaHCO3 -5.25 under-saturated
Trona NaHCO3:Na2CO3:2H2O -15.70 under-saturated
Natron Na2CO3:10H2O -9.39 under-saturated
Thermonatrite Na2CO3:H2O -10.82 under-saturated
Sulfur S -90.86 under-saturated
NaMetal Na -58.29 under-saturated

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