H2O + 1.0 mM   Na2SiO3
+ 1.0 mM   KOH
+ atmospheric CO2   (pCO2 = 3.408)

pH = 8.65

  (at 25 °C)
Electrical conductivity:   296.2 µS/cm   (info)
Ionic strength:   3.065 mmol/L   (info)
Alkalinity:   3.0 meq/L   (info)
Total hardness:   0.0 meq/L   (info)
Carbonate hardness:   3.0 meq/L   (info)
Redox potential (Eh):   -176 mV  

(NOTE: No   preselected minerals   precipitate.)


Elements   (in mM)

C(4) DIC 2.87e+00
Na Na 2.00e+00
K K 1.00e+00
S S 1.00e-12
S(6) Sulfate 1.00e-12
Si Si 1.00e+00

Aqueous Species   (in mM)

H+ 2.38e-06
OH- 4.72e-03
CO2 1.33e-02
HCO3- 2.79e+00
CO3-2 6.92e-02
NaOH 1.48e-06
Na+ 2.00e+00
NaHCO3 2.77e-03
NaCO3- 2.03e-03
NaSO4- 7.77e-15
KOH 1.45e-06
K+ 1.00e+00
KSO4- 5.45e-15
SO4-2 9.87e-13
H4SiO4 9.35e-01
H3SiO4- 6.50e-02
H2SiO4-2 2.34e-06
H2 3.26e-12

Minerals   (Ksp values)

Mineral Formula SI Saturation state
Thenardite Na2SO4 -20.20 under-saturated
Mirabilite Na2SO4:10H2O -19.41 under-saturated
Nahcolite NaHCO3 -4.76 under-saturated
Trona NaHCO3:Na2CO3:2H2O -14.23 under-saturated
Natron Na2CO3:10H2O -8.40 under-saturated
Thermonatrite Na2CO3:H2O -9.84 under-saturated
SiO2(a) SiO2 -0.32 under-saturated
Quartz SiO2 0.95 super-saturated
Chalcedony SiO2 0.52 super-saturated
Arcanite K2SO4 -19.32 under-saturated
Glaserite Na2K6(SO4)4 -76.44 under-saturated
K2CO3:1.5H2O K2CO3:1.5H2O -13.37 under-saturated
KNaCO3:6H2O KNaCO3:6H2O -9.95 under-saturated
Silicagel SiO2 -0.01 under-saturated
Sulfur S -30.60 under-saturated
NaMetal Na -45.60 under-saturated
KMetal K -49.50 under-saturated

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