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Chapter 26 Appendix B: Solubility-Product Constants (Ksp) 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

Source of data: CRC Handbook of Chemistry and Physics, 84th Edition (2004); sulfide data from Lange’s Handbook of Chemistry, 15th Edition (1999).