H2O + 1.0 mM   FeSO4
+ 0.11 mM   HNO3

pH = 4.01

  (at 25 °C)
Electrical conductivity:   261.2 µS/cm   (info)
Ionic strength:   3.746 mmol/L   (info)
Alkalinity:   -0.11 meq/L   (info)
Total hardness:   2.0 meq/L   (info)
Carbonate hardness:   0.0 meq/L   (info)
Redox potential (Eh):   78 mV  



Elements   (in mM)

S S 1.00e+00
S(6) Sulfate 1.00e+00
S(4) Sulfite 6.08e-12
S(-2) Sulfide 5.89e-11
Fe Fe 1.00e+00
Fe(2) Fe(II) 1.00e+00
Fe(3) Fe(III) 4.82e-10
N(5) Nitrate 1.10e-01

Aqueous Species   (in mM)

H+ 1.03e-01
OH- 1.11e-07
Fe+2 9.12e-01
FeOH+ 2.46e-06
Fe(OH)2 2.02e-13
FeSO4 8.74e-02
FeHSO4+ 5.95e-05
Fe+3 2.45e-12
FeOH+2 1.23e-10
Fe(OH)2+ 3.44e-10
Fe(OH)3 4.29e-13
Fe(OH)4- 4.31e-18
FeSO4+ 1.16e-11
FeHSO4+2 3.66e-15
Fe(SO4)2- 1.76e-13
HNO3 4.96e-07
NO3- 1.10e-01
HSO4- 7.01e-03
SO4-2 9.05e-01
H2S 5.89e-11
HS- 7.44e-14
H2SO3 3.97e-14
HSO3- 6.04e-12
SO3-2 5.13e-15
H2 1.50e-11

Minerals   (Ksp values)

Mineral Formula SI Saturation state
Fe(OH)3(a) Fe(OH)3 -7.70 under-saturated
Fe(OH)2 Fe(OH)2 -9.02 under-saturated
JarositeH H3OFe3(SO4)2(OH)6 -25.40 under-saturated
Goethite FeOOH -1.81 under-saturated
Hematite Fe2O3 -1.61 under-saturated
Magnetite Fe3O4 -4.47 under-saturated
Pyrite FeS2 -6.31 under-saturated
FeS(ppt) FeS -11.38 under-saturated
Mackinawite FeS -10.65 under-saturated
Greigite Fe3S4 -36.39 under-saturated
Sulfur S -7.39 under-saturated
FeO FeO -8.65 under-saturated
FeMetal Fe -21.77 under-saturated

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