H2O + 10.0 mM   Na2HPO4
+ 10.0 mM   NaH2PO4
+ atmospheric CO2   (pCO2 = 3.408)

pH = 6.95

  (at 25 °C)
Electrical conductivity:   2071.0 µS/cm   (info)
Ionic strength:   39.401 mmol/L   (info)
Alkalinity:   10.0 meq/L   (info)
Total hardness:   0.0 meq/L   (info)
Carbonate hardness:   10.0 meq/L   (info)
Redox potential (Eh):   -79 mV  

(NOTE: No   preselected minerals   precipitate.)


Elements   (in mM)

C(4) DIC 7.71e-02
Na Na 3.00e+01
P P 2.00e+01

Aqueous Species   (in mM)

H+ 1.29e-04
OH- 1.09e-04
CO2 1.32e-02
HCO3- 6.31e-02
CO3-2 4.46e-05
NaOH 3.97e-07
Na+ 2.97e+01
NaHCO3 7.36e-04
NaCO3- 1.23e-05
NaHPO4- 2.67e-01
H3PO4 1.29e-04
H2PO4- 1.01e+01
HPO4-2 9.67e+00
PO4-3 9.82e-05
H2 4.05e-12

Minerals   (Ksp values)

Mineral Formula SI Saturation state
Nahcolite NaHCO3 -5.33 under-saturated
Trona NaHCO3:Na2CO3:2H2O -15.94 under-saturated
Natron Na2CO3:10H2O -9.55 under-saturated
Thermonatrite Na2CO3:H2O -10.98 under-saturated
Na3PO4(cr) Na3PO4 -16.50 under-saturated
NaMetal Na -46.12 under-saturated

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