27 Appendix: Solubility Constants for Compounds at 25°C
| Compound Name | Compound Formula | K sp |
| Aluminum phosphate | AlPO4 | 9.84 × 10−21 |
| Barium bromate | Ba(BrO3)2 | 2.43 × 10−4 |
| Barium carbonate | BaCO3 | 2.58 × 10−9 |
| Barium chromate | BaCrO4 | 1.17 × 10−10 |
| Barium fluoride | BaF2 | 1.84 × 10−7 |
| Barium iodate | Ba(IO3)2 | 4.01 × 10−9 |
| Barium nitrate | Ba(NO3)2 | 4.64 × 10−3 |
| Barium sulfate | BaSO4 | 1.08 × 10−10 |
| Barium sulfite | BaSO3 | 5.0 × 10−10 |
| Beryllium hydroxide | Be(OH)2 | 6.92 × 10−22 |
| Bismuth arsenate | BiAsO4 | 4.43 × 10−10 |
| Bismuth iodide | BiI3 | 7.71 × 10−19 |
| Cadmium carbonate | CdCO3 | 1.0 × 10−12 |
| Cadmium fluoride | CdF2 | 6.44 × 10−3 |
| Cadmium hydroxide | Cd(OH)2 | 7.2 × 10−15 |
| Cadmium iodate | Cd(IO3)2 | 2.5 × 10−8 |
| Cadmium phosphate | Cd3(PO4)2 | 2.53 × 10−33 |
| Cadmium sulfide | CdS | 8.0 × 10−27 |
| Calcium carbonate | CaCO3 | 3.36 × 10−9 |
| Calcium fluoride | CaF2 | 3.45 × 10−11 |
| Calcium hydroxide | Ca(OH)2 | 5.02 × 10−6 |
| Calcium iodate | Ca(IO3)2 | 6.47 × 10−6 |
| Calcium phosphate | Ca3(PO4)2 | 2.07 × 10−33 |
| Calcium sulfate | CaSO4 | 4.93 × 10−5 |
| Cesium perchlorate | CsClO4 | 3.95 × 10−3 |
| Cesium periodate | CsIO4 | 5.16 × 10−6 |
| Cobalt(II) arsenate | Co3(AsO4)2 | 6.80 × 10−29 |
| Cobalt(II) hydroxide | Co(OH)2 | 5.92 × 10−15 |
| Cobalt(II) phosphate | Co3(PO4)2 | 2.05 × 10−35 |
| Copper(I) bromide | CuBr | 6.27 × 10−9 |
| Copper(I) chloride | CuCl | 1.72 × 10−7 |
| Copper(I) cyanide | CuCN | 3.47 × 10−20 |
| Copper(I) iodide | CuI | 1.27 × 10−12 |
| Copper(I) thiocyanate | CuSCN | 1.77 × 10−13 |
| Copper(II) arsenate | Cu3(AsO4)2 | 7.95 × 10−36 |
| Copper(II) oxalate | CuC2O4 | 4.43 × 10−10 |
| Copper(II) phosphate | Cu3(PO4)2 | 1.40 × 10−37 |
| Copper(II) sulfide | CuS | 6.3 × 10−36 |
| Europium(III) hydroxide | Eu(OH)3 | 9.38 × 10−27 |
| Gallium(III) hydroxide | Ga(OH)3 | 7.28 × 10−36 |
| Iron(II) carbonate | FeCO3 | 3.13 × 10−11 |
| Iron(II) fluoride | FeF2 | 2.36 × 10−6 |
| Iron(II) hydroxide | Fe(OH)2 | 4.87 × 10−17 |
| Iron(III) hydroxide | Fe(OH)3 | 2.79 × 10−39 |
| Iron(III) sulfide | FeS | 6.3 × 10−18 |
| Lanthanum iodate | La(IO3)3 | 7.50 × 10−12 |
| Lead(II) bromide | PbBr2 | 6.60 × 10−6 |
| Lead(II) carbonate | PbCO3 | 7.40 × 10−14 |
| Lead(II) chloride | PbCl2 | 1.70 × 10−5 |
| Lead(II) fluoride | PbF2 | 3.3 × 10−8 |
| Lead(II) hydroxide | Pb(OH)2 | 1.43 × 10−20 |
| Lead(II) iodate | Pb(IO3)2 | 3.69 × 10−13 |
| Lead(II) iodide | PbI2 | 9.8 × 10−9 |
| Lead(II)selenite | PbSeO4 | 1.37 × 10−7 |
| Lead(II) sulfate | PbSO4 | 2.53 × 10−8 |
| Lead(II) sulfide | PbS | 8.0 × 10−28 |
| Lithium carbonate | Li2CO3 | 8.15 × 10−4 |
| Lithium fluoride | LiF | 1.84 × 10−3 |
| Lithium phosphate | Li3PO4 | 2.37 × 10−11 |
| Magnesium carbonate | MgCO3 | 6.82 × 10−6 |
| Magnesium fluoride | MgF2 | 5.16 × 10−11 |
| Magnesium hydroxide | Mg(OH)2 | 5.61 × 10−12 |
| Magnesium phosphate | Mg3(PO4)2 | 1.04 × 10−24 |
| Manganese(II) carbonate | MnCO3 | 2.24 × 10−11 |
| Manganese(II) iodate | Mn(IO3)2 | 4.37 × 10−7 |
| Mercury(I) bromide | Hg2Br2 | 6.40 × 10−23 |
| Mercury(I) carbonate | Hg2CO3 | 3.6 × 10−17 |
| Mercury(I) chloride | Hg2Cl2 | 1.43 × 10−18 |
| Mercury(I) fluoride | Hg2F2 | 3.10 × 10−6 |
| Mercury(I) iodide | Hg2I2 | 5.2 × 10−29 |
| Mercury(I) oxalate | Hg2C2O4 | 1.75 × 10−13 |
| Mercury(I) sulfate | Hg2SO4 | 6.5 × 10−7 |
| Mercury(I) thiocyanate | Hg2(SCN)2 | 3.2 × 10−20 |
| Mercury(II) bromide | HgBr2 | 6.2 × 10−20 |
| Mercury (II) iodide | HgI2 | 2.9 × 10−29 |
| Mercury(II) sulfide (red) | HgS | 4 × 10−53 |
| Mercury(II) sulfide (black) | HgS | 1.6 × 10−52 |
| Neodymium carbonate | Nd2(CO3)3 | 1.08 × 10−33 |
| Nickel(II) carbonate | NiCO3 | 1.42 × 10−7 |
| Nickel(II) hydroxide | Ni(OH)2 | 5.48 × 10−16 |
| Nickel(II) iodate | Ni(IO3)2 | 4.71 × 10−5 |
| Nickel(II) phosphate | Ni3(PO4)2 | 4.74 × 10−32 |
| Palladium(II) thiocyanate | Pd(SCN)2 | 4.39 × 10−23 |
| Potassium hexachloroplatinate | K2PtCl6 | 7.48 × 10−6 |
| Potassium perchlorate | KClO4 | 1.05 × 10−2 |
| Potassium periodate | KIO4 | 3.71 × 10−4 |
| Praseodymium hydroxide | Pr(OH)3 | 3.39 × 10−24 |
| Rubidium perchlorate | RbClO4 | 3.00 × 10−3 |
| Scandium fluoride | ScF3 | 5.81 × 10−24 |
| Scandium hydroxide | Sc(OH)3 | 2.22 × 10−31 |
| Silver(I) acetate | AgCH3CO2 | 1.94 × 10−3 |
| Silver(I) arsenate | Ag3AsO4 | 1.03 × 10−22 |
| Silver(I) bromate | AgBrO3 | 5.38 × 10−5 |
| Silver(I) bromide | AgBr | 5.35 × 10−13 |
| Silver(I) carbonate | Ag2CO3 | 8.46 × 10−12 |
| Silver(I) chloride | AgCl | 1.77 × 10−10 |
| Silver(I) chromate | Ag2CrO4 | 1.12 × 10−12 |
| Silver(I) cyanide | AgCN | 5.97 × 10−17 |
| Silver(I) iodate | AgIO3 | 3.17 × 10−8 |
| Silver(I) iodide | AgI | 8.52 × 10−17 |
| Silver(I) oxalate | Ag2C2O4 | 5.40 × 10−12 |
| Silver(I) phosphate | Ag3PO4 | 8.89 × 10−17 |
| Silver(I) sulfate | Ag2SO4 | 1.20 × 10−5 |
| Silver(I) sulfide | Ag2S | 6.3 × 10−50 |
| Silver(I) sulfite | Ag2SO3 | 1.50 × 10−14 |
| Silver(I) thiocyanate | AgSCN | 1.03 × 10−12 |
| Strontium arsenate | Sr3(AsO4)2 | 4.29 × 10−19 |
| Strontium carbonate | SrCO3 | 5.60 × 10−10 |
| Strontium fluoride | SrF2 | 4.33 × 10−9 |
| Strontium iodate | Sr(IO3)2 | 1.14 × 10−7 |
| Strontium sulfate | SrSO4 | 3.44 × 10−7 |
| Thallium(I) bromate | TlBrO3 | 1.10 × 10−4 |
| Thallium(I) bromide | TlBr | 3.71 × 10−6 |
| Thallium(I) chloride | TlCl | 1.86 × 10−4 |
| Thallium(I) chromate | Tl2CrO4 | 8.67 × 10−13 |
| Thallium(I) iodate | TlIO3 | 3.12 × 10−6 |
| Thallium(I) iodide | TlI | 5.54 × 10−8 |
| Thallium(I) thiocyanate | TlSCN | 1.57 × 10−4 |
| Thallium(III) hydroxide | Tl(OH)3 | 1.68 × 10−44 |
| Tin(II) hydroxide | Sn(OH)2 | 5.45 × 10−27 |
| Tin(II) sulfide | SnS | 1.0 × 10−25 |
| Yttrium carbonate | Y2(CO3)3 | 1.03 × 10−31 |
| Yttrium fluoride | YF3 | 8.62 × 10−21 |
| Yttrium hydroxide | Y(OH)3 | 1.00 × 10−22 |
| Yttrium iodate | Y(IO3)3 | 1.12 × 10−10 |
| Zinc arsenate | Zn3(AsO4)2 | 2.8 × 10−28 |
| Zinc carbonate | ZnCO3 | 1.46 × 10−10 |
| Zinc fluoride | ZnF2 | 3.04 × 10−2 |
| Zinc hydroxide | Zn(OH)2 | 3 × 10−17 |
| Zinc selenide | ZnSe | 3.6 × 10−26 |
| Zinc sulfide (wurtzite) | ZnS | 1.6 × 10−24 |
| Zinc sulfide (sphalerite) | ZnS | 2.5 × 10−22 |
From UC Davis Chem Wiki (creative commons licence): UC Davis GeoWiki by University of California, Davis. CC-BY-NC-SA-3.0
Original source of data: CRC Handbook of Chemistry and Physics, 84th Edition (2004); sulfide data from Lange’s Handbook of Chemistry, 15th Edition (1999).
