H2O + 25.0 mM   FeSO4

pH = 5.93

  (at 25 °C)
Electrical conductivity:   3058.3 µS/cm   (info)
Ionic strength:   64.641 mmol/L   (info)
Alkalinity:   0.0 meq/L   (info)
Total hardness:   50.0 meq/L   (info)
Carbonate hardness:   0.0 meq/L   (info)
Redox potential (Eh):   -73 mV  



Elements   (in mM)

S S 2.50e+01
S(6) Sulfate 2.50e+01
S(4) Sulfite 1.71e-11
S(-2) Sulfide 1.08e-08
Fe Fe 2.50e+01
Fe(2) Fe(II) 2.50e+01
Fe(3) Fe(III) 8.67e-08

Aqueous Species   (in mM)

H+ 1.39e-03
OH- 1.08e-05
Fe+2 1.62e+01
Fe(OH)3- 5.64e-13
FeOH+ 2.44e-03
Fe(OH)2 1.42e-08
FeSO4 8.84e+00
FeHSO4+ 8.54e-05
Fe(HS)2 5.78e-15
Fe+3 1.91e-13
FeOH+2 5.28e-10
Fe(OH)2+ 7.91e-08
Fe(OH)3 6.99e-09
Fe(OH)4- 6.81e-12
FeSO4+ 3.85e-12
FeHSO4+2 2.31e-17
Fe(SO4)2- 5.86e-13
HSO4- 9.76e-04
SO4-2 1.62e+01
H2S 9.56e-09
HS- 1.20e-09
S-2 2.28e-16
H2SO3 1.05e-15
HSO3- 1.54e-11
SO3-2 1.70e-12
H2 2.72e-10

Minerals   (Ksp values)

Mineral Formula SI Saturation state
Fe(OH)3(a) Fe(OH)3 -3.48 under-saturated
Fe(OH)2 Fe(OH)2 -4.17 under-saturated
JarositeH H3OFe3(SO4)2(OH)6 -18.43 under-saturated
Goethite FeOOH 2.41 super-saturated
Hematite Fe2O3 6.83 super-saturated
Magnetite Fe3O4 8.81 super-saturated
Pyrite FeS2 1.71 super-saturated
FeS(ppt) FeS -4.31 under-saturated
Mackinawite FeS -3.58 under-saturated
Greigite Fe3S4 -14.23 under-saturated
Sulfur S -6.44 under-saturated
FeO FeO -3.80 under-saturated
FeMetal Fe -15.66 under-saturated

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