Solubility Product Constants Ksp at 25°C (2023)

The solid phases of aqion are listed here in two tables (together with the solubility product in form of pKsp = - log10 Ksp):

  • Table sorted by formula
  • Table sorted by mineral name

Only a subset of these minerals enter the equilibrium calculations by default. These ‘equilibrium phases’ are marked with a bullet (•). The user is free to activate or deactivate any other mineral to enter the equilibrium calculations – see here.

Table sorted by mineral formula

Formula Name pKsp Ref
(NH4)2CrO4 Amm2CrO4 -0.40 W
Al(OH)3 Al(OH)3(a) 31.17 W
Al(OH)3 Gibbsite 33.86 W
Al2Si2O5(OH)4 Kaolinite W
AlOHSO4 Jurbanite 17.22 W
AlOOH Diaspore 35.09 W
AlOOH Boehmite 33.39 W
AsI3 AsI3 W
Ba3(AsO4)2 Ba3(AsO4)2 50.11 W
BaCO3 Witherite 8.56 W
BaCrO4 BaCrO4 9.67 M
BaF2 BaF2 5.76 W
BaSO4 Barite 9.97 W
Ca(OH)2 Portlandite 5.18 W
Ca(UO2)2(SiO3OH)2 Uranophane W
Ca0.165Al2.33Si3.67O10(OH)2 Montmorillonite-Ca W
Ca5(PO4)3OH Hydroxyapatite 54.45 W
Ca6Al2(SO4)3(OH)12:26H2O Ettringite -62.54 L
CaAl2Si2O8 Anorthite W
CaCl2 Hydrophilite -11.79 L
CaCl2:6H2O Antarcticite -4.09 L
CaCO3 Calcite 8.48 W
CaCO3 Aragonite 8.34 W
CaCO3 Vaterite 7.91 1
CaCO3 CaCO3(a) 6.40 2
CaCO3:6H2O Ikaite 6.62 2
CaCO3:H2O CaCO3:H2O 7.33 2
CaCrO4 CaCrO4 2.27 M
CaF2 Fluorite 10.60 W
CaHPO4 Monetite 6.91 M
CaHPO4:2H2O Brushite 6.61 M
CaMg(CO3)2 Dolomite 17.09 W
CaMgSi2O6 Diopside W
CaMoO4 Powellite 7.95 M
CaSO4 Anhydrite 4.36 W
CaSO4:2H2O Gypsum 4.58 W
Cd(BO2)2 Cd(BO2)2 -0.60 W
Cd(OH)2 Cd(OH)2(a) 14.25 W
Cd3(PO4)2 Cd3(PO4)2 32.60 W
CdBr2:4H2O CdBr2:4H2O 2.42 W
CdCl2 CdCl2 0.68 W
CdCl2:H2O CdCl2:H2O 1.71 W
CdCO3 Otavite 12.10 W
CdF2 CdF2 2.98 W
CdI2 CdI2 3.61 W
CdS Greenockite 29.92 W
CdSO4 CdSO4 0.10 W
CdSO4:H2O CdSO4:H2O 1.66 W
Cr(OH)2 Cr(OH)2 17.16 M
Cr(OH)3 Cr(OH)3(A) 33.10 M
Cr(OH)3 Cr(OH)3(C) 30.65 M
CrBr3 CrBr3 -29.53 M
CrCl2 CrCl2 -15.87 M
CrCl3 CrCl3 -23.13 M
CrF3 CrF3 3.64 M
CrI3 CrI3 -30.10 M
Cu(OH)2 Cu(OH)2 19.34 W
Cu0.066Cu1.868S Djurleite 47.91 W
Cu0.25Cu1.5S Anilite 45.87 W
Cu0.6Cu0.8S BlaubleiI 38.15 W
Cu0.9Cu0.2S BlaubleiII 41.27 W
Cu2(OH)2CO3 Malachite 33.16 W
Cu2(OH)3Cl Atacamite 34.63 W
Cu2(OH)3NO3 Cu2(OH)3NO3 32.73 W
Cu2S Chalcocite 48.61 W
Cu3(AsO4)2:6H2O Cu3(AsO4)2:6w 35.12 W
Cu3(OH)2(CO3)2 Azurite 44.89 W
Cu3(OH)4SO4 Antlerite 47.67 W
Cu3(PO4)2 Cu3(PO4)2 36.85 W
Cu3(PO4)2:3H2O Cu3(PO4)2:3H2O 35.12 W
Cu4(OH)6SO4 Brochantite 68.60 W
Cu4(OH)6SO4:H2O Langite 67.15 W
CuCl2 Melanothallite -3.73 W
CuCO3 CuCO3 9.63 W
CuCrO4 CuCrO4 5.48 M
CuF2 CuF2 0.62 W
CuF2:2H2O CuF2:2H2O 4.55 W
CuFeO2 CuprousFerrite 64.88 W
CuFeS2 Chalcopyrite 49.26 W
CuI CuI 11.89 W
CuO Tenorite 20.36 W
CuS Covellite 36.26 W
CuSO4:5H2O Chalcanthite 2.64 W
Fe(OH)2 Fe(OH)2 14.08 L
Fe(OH)3 Fe(OH)3(a) 37.08 W
Fe2O3 Hematite 87.95 W
Fe3O4 Magnetite 108.18 W
Fe3S4 Greigite 101.00 W
Fe3Si2O5(OH)4 Greenalite 63.13 W
FeAsO4:2H2O Scorodite 20.25 W
FeCO3 Siderite 10.89 W
FeCr2O4 FeCr2O4 M
FeMoO4 FeMoO4 10.09 M
FeO FeO 14.45 L
FeOOH Goethite 42.97 W
FePO4:2H2O Strengite 26.40 W
FeS FeS(ppt) 17.91 W
FeS Mackinawite 18.64 W
FeS2 Pyrite 26.89 W
H3OFe3(SO4)2(OH)6 JarositeH 75.34 W
Hg(OH)2 Hg(OH)2 25.38 M
HgCl2 HgCl2 15.69 M
HgS Cinnabar 53.08 M
HgS Metacinnabar 52.72 M
HgSO4 HgSO4 3.32 M
K0.6Mg0.25Al2.3Si3.5O10(OH)2 Illite W
K0.77Na0.03H0.2Fe3(SO4)2(OH)6 Jarosite(ss) 90.35 W
K2Ca(SO4)2:H2O Syngenite 7.60 L
K2CO3:1.5H2O K2CO3:1.5H2O 3.30 L
K2Cr2O7 K2Cr2O7 15.67 M
K2CrO4 K2CrO4 -0.01 M
K2MoO4 K2MoO4 -3.26 M
K2SO4 Arcanite 1.80 L
KAl(SO4)2:12H2O AlumK 5.17 W
KAl3(SO4)2(OH)6 Alunite 85.34 W
KAl3Si3O10(OH)2 Kmica W
KAlSi3O8 Adularia W
KCl Sylvite -0.85 L
KFe3(SO4)2(OH)6 Jarosite-K 93.15 W
KNaCO3:6H2O KNaCO3:6H2O 6.42 L
Li2CrO4 Li2CrO4 -4.86 M
Mg(OH)2 Brucite 11.14 W
Mg3(PO4)2:22H2O Mg3(PO4)2:22H2O 23.10 3
Mg3(PO4)2:8H2O Bobierrite 25.20 3
Mg3Si4O10(OH)2 Talc W
MgCl2:6H2O Bischofite -4.39 L
MgCO3 Magnesite 8.03 W
MgCr2O4 MgCr2O4 M
MgCrO4 MgCrO4 -5.38 M
MgHPO4:3H2O Newberyite 5.80 3
MgMoO4 MgMoO4 1.85 M
MgNH4PO4:6H2O Struvite 13.17 4
Mn(OH)2 Pyrochroite 12.78 W
Mn2(SO4)3 Mn2(SO4)3 5.71 W
Mn2O3 Bixbyite 84.55 W
Mn3(AsO4)2:8H2O Mn3(AsO4)2:8H2O 28.71 W
Mn3(PO4)2 Mn3(PO4)2 23.83 W
Mn3O4 Hausmannite 54.15 W
MnCl2:4H2O MnCl2:4H2O -2.71 W
MnCO3 Rhodochrosite(d) 10.39 W
MnHPO4 MnHPO4 12.95 W
MnO2 Pyrolusite 17.84 W
MnO2 Birnessite 15.62 W
MnOOH Manganite 18.26 W
MnS MnS(Green) 10.19 W
MnSO4 MnSO4 -2.67 W
Na2Ca(SO4)2 Glauberite 5.47 L
Na2CO3:10H2O Natron 1.31 W
Na2CO3:H2O Thermonatrite -0.13 W
Na2Cr2O7 Na2Cr2O7 9.90 M
Na2CrO4 Na2CrO4 -3.26 M
Na2K6(SO4)4 Glaserite 7.61 3
Na2SO4 Thenardite 0.18 W
Na2SO4:10H2O Mirabilite 1.11 W
NaAlSi3O8 Albite W
NaCl Halite -1.58 W
NaFe3(SO4)2(OH)6 Jarosite-Na 89.22 W
NaHCO3 Nahcolite 0.55 W
NaHCO3:Na2CO3:2H2O Trona 0.80 W
Ni(OH)2 Ni(OH)2 17.18 W
NiCO3 NiCO3 6.84 W
NiS Millerite 22.03 W
Nsutite Nsutite 16.66 W
Pb(OH)2 Pb(OH)2 19.83 W
Pb3(AsO4)2 Pb3(AsO4)2 35.40 W
Pb5(PO4)3Cl Clpyromorphite 84.43 W
Pb5(PO4)3OH Hxypyromorphite 76.78 W
PbBr2 PbBr2 5.18 W
PbBrF PbBrF 8.49 W
PbClF Matlockite 9.43 W
PbCO3 Cerrusite 13.13 W
PbCrO4 PbCrO4 13.68 M
PbF2 PbF2 7.44 W
PbHPO4 PbHPO4 11.46 W
PbI2 PbI2 8.07 W
PbS Galena 26.77 W
PbSO4 Anglesite 7.79 W
S Sulfur 10.52 W
SiO2 SiO2(a) 2.71 W
SiO2 Quartz 3.98 W
SiO2 Chalcedony 3.55 W
SiO2 Silicagel 3.02 W
SrCO3 Strontianite 9.27 W
SrCrO4 SrCrO4 4.84 M
SrF2 SrF2 8.54 W
SrSO4 Celestite 6.63 W
U3O8 U3O8(c) W
U4O9 U4O9(c) W
UO2 UO2(a) 55.86 W
UO2 Uraninite(c) 60.76 W
UO2(OH)2:H2O Schoepite 22.58 W
UO2CO3 Rutherfordine 14.45 W
USiO4 Coffinite W
Zn(OH)2 Zn(OH)2-c 15.78 W
Zn3(AsO4)2:2.5H2O Zn3(AsO4)2:2.5w 27.55 W
Zn3(PO4)2:4H2O Zn3(PO4)2:4w 32.04 W
ZnCO3 Smithsonite 10.00 W
ZnS Sphalerite 25.61 W
ZnS Wurtzite 23.67 W
ZnS ZnS(a) 23.04 W

Table sorted by mineral name

Mineral Formula pKsp Ref
Adularia KAlSi3O8 W
Al(OH)3(a) Al(OH)3 31.17 W
Albite NaAlSi3O8 W
AlumK KAl(SO4)2:12H2O 5.17 W
Alunite KAl3(SO4)2(OH)6 85.34 W
Amm2CrO4 (NH4)2CrO4 -0.40 W
Anglesite PbSO4 7.79 W
Anhydrite CaSO4 4.36 W
Anilite Cu0.25Cu1.5S 45.87 W
Anorthite CaAl2Si2O8 W
Antarcticite CaCl2:6H2O -4.09 L
Antlerite Cu3(OH)4SO4 47.67 W
Aragonite CaCO3 8.34 W
Arcanite K2SO4 1.80 L
AsI3 AsI3 W
Atacamite Cu2(OH)3Cl 34.63 W
Azurite Cu3(OH)2(CO3)2 44.89 W
Ba3(AsO4)2 Ba3(AsO4)2 50.11 W
BaCrO4 BaCrO4 9.67 M
BaF2 BaF2 5.76 W
Barite BaSO4 9.97 W
Birnessite MnO2 15.62 W
Bischofite MgCl2:6H2O -4.39 L
Bixbyite Mn2O3 84.55 W
BlaubleiI Cu0.6Cu0.8S 38.15 W
BlaubleiII Cu0.9Cu0.2S 41.27 W
Bobierrite Mg3(PO4)2:8H2O 25.20 3
Boehmite AlOOH 33.39 W
Brochantite Cu4(OH)6SO4 68.60 W
Brucite Mg(OH)2 11.14 W
Brushite CaHPO4:2H2O 6.61 M
CaCO3(a) CaCO3 6.40 2
CaCO3:H2O CaCO3:H2O 7.33 2
CaCrO4 CaCrO4 2.27 M
Calcite CaCO3 8.48 W
Cd(BO2)2 Cd(BO2)2 -0.60 W
Cd(OH)2(a) Cd(OH)2 14.25 W
Cd3(PO4)2 Cd3(PO4)2 32.60 W
CdBr2:4H2O CdBr2:4H2O 2.42 W
CdCl2 CdCl2 0.68 W
CdCl2:H2O CdCl2:H2O 1.71 W
CdF2 CdF2 2.98 W
CdI2 CdI2 3.61 W
CdSO4 CdSO4 0.10 W
CdSO4:H2O CdSO4:H2O 1.66 W
Celestite SrSO4 6.63 W
Cerrusite PbCO3 13.13 W
Chalcanthite CuSO4:5H2O 2.64 W
Chalcedony SiO2 3.55 W
Chalcocite Cu2S 48.61 W
Chalcopyrite CuFeS2 49.26 W
Cinnabar HgS 53.08 M
Clpyromorphite Pb5(PO4)3Cl 84.43 W
Coffinite USiO4 W
Covellite CuS 36.26 W
Cr(OH)2 Cr(OH)2 17.16 M
Cr(OH)3(A) Cr(OH)3 33.10 M
Cr(OH)3(C) Cr(OH)3 30.65 M
CrBr3 CrBr3 -29.53 M
CrCl2 CrCl2 -15.87 M
CrCl3 CrCl3 -23.13 M
CrF3 CrF3 3.64 M
CrI3 CrI3 -30.10 M
Cu(OH)2 Cu(OH)2 19.34 W
Cu2(OH)3NO3 Cu2(OH)3NO3 32.73 W
Cu3(AsO4)2:6w Cu3(AsO4)2:6H2O 35.12 W
Cu3(PO4)2 Cu3(PO4)2 36.85 W
Cu3(PO4)2:3H2O Cu3(PO4)2:3H2O 35.12 W
CuCO3 CuCO3 9.63 W
CuCrO4 CuCrO4 5.48 M
CuF2 CuF2 0.62 W
CuF2:2H2O CuF2:2H2O 4.55 W
CuI CuI 11.89 W
CuprousFerrite CuFeO2 64.88 W
Diaspore AlOOH 35.09 W
Diopside CaMgSi2O6 W
Djurleite Cu0.066Cu1.868S 47.91 W
Dolomite CaMg(CO3)2 17.09 W
Ettringite Ca6Al2(SO4)3(OH)12:26H2O -62.54 L
Fe(OH)2 Fe(OH)2 14.08 L
Fe(OH)3(a) Fe(OH)3 37.08 W
FeCr2O4 FeCr2O4 M
FeMoO4 FeMoO4 10.09 M
FeO FeO 14.45 L
FeS(ppt) FeS 17.91 W
Fluorite CaF2 10.60 W
Galena PbS 26.77 W
Gibbsite Al(OH)3 33.86 W
Glaserite Na2K6(SO4)4 7.61 3
Glauberite Na2Ca(SO4)2 5.47 L
Goethite FeOOH 42.97 W
Greenalite Fe3Si2O5(OH)4 63.13 W
Greenockite CdS 29.92 W
Greigite Fe3S4 101.00 W
Gypsum CaSO4:2H2O 4.58 W
Halite NaCl -1.58 W
Hausmannite Mn3O4 54.15 W
Hematite Fe2O3 87.95 W
Hg(OH)2 Hg(OH)2 25.38 M
HgCl2 HgCl2 15.69 M
HgSO4 HgSO4 3.32 M
Hxypyromorphite Pb5(PO4)3OH 76.78 W
Hydrophilite CaCl2 -11.79 L
Hydroxyapatite Ca5(PO4)3OH 54.45 W
Ikaite CaCO3:6H2O 6.62 2
Illite K0.6Mg0.25Al2.3Si3.5O10(OH)2 W
Jarosite(ss) K0.77Na0.03H0.2Fe3(SO4)2(OH)6 90.35 W
JarositeH H3OFe3(SO4)2(OH)6 75.34 W
Jarosite-K KFe3(SO4)2(OH)6 93.15 W
Jarosite-Na NaFe3(SO4)2(OH)6 89.22 W
Jurbanite AlOHSO4 17.22 W
K2CO3:1.5H2O K2CO3:1.5H2O 3.30 L
K2Cr2O7 K2Cr2O7 15.67 M
K2CrO4 K2CrO4 -0.01 M
K2MoO4 K2MoO4 -3.26 M
Kaolinite Al2Si2O5(OH)4 W
Kmica KAl3Si3O10(OH)2 W
KNaCO3:6H2O KNaCO3:6H2O 6.42 L
Langite Cu4(OH)6SO4:H2O 67.15 W
Li2CrO4 Li2CrO4 -4.86 M
Mackinawite FeS 18.64 W
Magnesite MgCO3 8.03 W
Magnetite Fe3O4 108.18 W
Malachite Cu2(OH)2CO3 33.16 W
Manganite MnOOH 18.26 W
Matlockite PbClF 9.43 W
Melanothallite CuCl2 -3.73 W
Metacinnabar HgS 52.72 M
Mg3(PO4)2:22H2O Mg3(PO4)2:22H2O 23.10 3
MgCr2O4 MgCr2O4 M
MgCrO4 MgCrO4 -5.38 M
MgMoO4 MgMoO4 1.85 M
Millerite NiS 22.03 W
Mirabilite Na2SO4:10H2O 1.11 W
Mn2(SO4)3 Mn2(SO4)3 5.71 W
Mn3(AsO4)2:8H2O Mn3(AsO4)2:8H2O 28.71 W
Mn3(PO4)2 Mn3(PO4)2 23.83 W
MnCl2:4H2O MnCl2:4H2O -2.71 W
MnHPO4 MnHPO4 12.95 W
MnS(Green) MnS 10.19 W
MnSO4 MnSO4 -2.67 W
Monetite CaHPO4 6.91 M
Montmorillonite-Ca Ca0.165Al2.33Si3.67O10(OH)2 W
Na2Cr2O7 Na2Cr2O7 9.90 M
Na2CrO4 Na2CrO4 -3.26 M
Nahcolite NaHCO3 0.55 W
Natron Na2CO3:10H2O 1.31 W
Newberyite MgHPO4:3H2O 5.80 3
Ni(OH)2 Ni(OH)2 17.18 W
NiCO3 NiCO3 6.84 W
Nsutite Nsutite 16.66 W
Otavite CdCO3 12.10 W
Pb(OH)2 Pb(OH)2 19.83 W
Pb3(AsO4)2 Pb3(AsO4)2 35.40 W
PbBr2 PbBr2 5.18 W
PbBrF PbBrF 8.49 W
PbCrO4 PbCrO4 13.68 M
PbF2 PbF2 7.44 W
PbHPO4 PbHPO4 11.46 W
PbI2 PbI2 8.07 W
Portlandite Ca(OH)2 5.18 W
Powellite CaMoO4 7.95 M
Pyrite FeS2 26.89 W
Pyrochroite Mn(OH)2 12.78 W
Pyrolusite MnO2 17.84 W
Quartz SiO2 3.98 W
Rhodochrosite(d) MnCO3 10.39 W
Rutherfordine UO2CO3 14.45 W
Schoepite UO2(OH)2:H2O 22.58 W
Scorodite FeAsO4:2H2O 20.25 W
Siderite FeCO3 10.89 W
Silicagel SiO2 3.02 W
SiO2(a) SiO2 2.71 W
Smithsonite ZnCO3 10.00 W
Sphalerite ZnS 25.61 W
SrCrO4 SrCrO4 4.84 M
SrF2 SrF2 8.54 W
Strengite FePO4:2H2O 26.40 W
Strontianite SrCO3 9.27 W
Struvite MgNH4PO4:6H2O 13.17 4
Sulfur S 10.52 W
Sylvite KCl -0.85 L
Syngenite K2Ca(SO4)2:H2O 7.60 L
Talc Mg3Si4O10(OH)2 W
Tenorite CuO 20.36 W
Thenardite Na2SO4 0.18 W
Thermonatrite Na2CO3:H2O -0.13 W
Trona NaHCO3:Na2CO3:2H2O 0.80 W
U3O8(c) U3O8 W
U4O9(c) U4O9 W
UO2(a) UO2 55.86 W
Uraninite(c) UO2 60.76 W
Uranophane Ca(UO2)2(SiO3OH)2 W
Vaterite CaCO3 7.91 1
Witherite BaCO3 8.56 W
Wurtzite ZnS 23.67 W
Zn(OH)2-c Zn(OH)2 15.78 W
Zn3(AsO4)2:2.5w Zn3(AsO4)2:2.5H2O 27.55 W
Zn3(PO4)2:4w Zn3(PO4)2:4H2O 32.04 W
ZnS(a) ZnS 23.04 W

References

Most of the data are taken from PhreeqC’s thermodynamic databases:

[W] Database wateq4f: J.W. Ball and D.K. Nordstrom: WATEQ4F – User’s manual with revised thermodynamic data base and test cases for calculating speciation of major, trace and redox elements in natural waters, U.S.G.S. Open-File Report 90-129, 1991
[M] Database minteq: J.D. Allison, D.S. Brown, K.J. Novo-Gradac: MINTEQA2/PRODEFA2, A Geochemical Assessment Model for Environmental Systems, Version 3.0, User’s Manual, EPA/600/3-91/021, March 1991
[L] Database llnl: ‘thermo.com.V8.R6.230’ prepared by Jim Johnson at Lawrence Livermore National Laboratory, in Geochemist’s Workbench format. Converted to PhreeqC format by Greg Anderson with help from David Parkhurst (llnl.dat 4023 2010-02-09 21:02:42Z dlpark)

Additional data are taken from:

  1. L.N. Plummer, E. Busenberg: The solubilities of calcite, aragonite and vaterite in CO2-H2O solutions between 0 and 90°C, Geochimica et Cosmochimica Acta, 46: 1011-1040, 1982↩2

  2. J.Y. Gal, Y. Fovet, N. Gache: Mechanisms of scale formation and carbon dioxide partial pressure influence, Water Res., 36 (2002) 755-763↩2↩3↩4↩5↩6

  3. Database sit.dat: developed by Amphos 21, BRGM (French Bureau of Research for Geology and Mining), and HydrAsa for ANDRA (French Agency for the Management of Nuclear Waste).↩2↩3↩4↩5↩6↩7↩8

  4. M. Hanhoun et al.: Temperature impact assessment on struvite solubility product: A thermodynamic modeling approach, Chemical Engineering Journal 167 (2011) 50-58↩2

[last modified: 2017-01-21]


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