Below, is an exhaustive list of solubility product constants |K_{sp}| for some substances that are poorly soluble in water at 25 °C.
| Substance | |K_{sp}| | Substance | |K_{sp}| |
| |AgBr| | |5.35\times 10^{-13}| | |CaSO_{4}\times2 H_{2}O| | |3.14\times 10^{-5}| |
| |AgCH_{3}COO| | |1.94\times 10^{-3}| | |CaSO_{3}\times0.5 H_{2}O| | |3.1\times 10^{-7}| |
| |Ag_{2}CO_{3}| | |8.46\times 10^{-12}| | |Co(OH)_{2}| | |5.92\times 10^{-15}| |
| |AgCl| | |1.77\times 10^{-10}| | |Co_{3}(PO_{4})_{2}| | |2.05\times 10^{-35}| |
| |AgI| | |8.52\times 10^{-17}| | |CuBr| | |6.27\times 10^{-9}| |
| |Ag_{3}PO_{4}| | |8.89\times 10^{-17}| | |CuCl| | |1.72\times 10^{-7}| |
| |Ag_{2}SO_{4}| | |1.2\times 10^{-5}| | |CuI| | |1.27\times 10^{-12}| |
| |Ag_{2}SO_{3}| | |1.5\times 10^{-14}| | |Cu_{3}(PO_{4})_{2}| | |1.40\times 10^{-37}| |
| |AlPO_{4}| | |9.84\times 10^{-21}| | |FeCO_{3}| | |3.13\times 10^{-11}| |
| |BaCO_{3}| | |2.58\times 10^{-9}| | |Fe(OH)_{2}| | |4.87\times 10^{-17}| |
| |BaF_{2}| | |1.84\times 10^{-7}| | |Fe(OH)_{3}| | |2.79\times 10^{-39}| |
| |Ba(OH)_{2}\times8 H_{2}O| | |2.55\times 10^{-4}| | |FePO_{4}\times2 H_{2}O| | |9.91\times 10^{-16}| |
| |Ba(NO_{3})_{2}| | |4.64\times 10^{-3}| | |Hg_{2}Br_{2}| | |6.40\times 10^{-23}| |
| |BaSO_{4}| | |1.08\times 10^{-10}| | |Hg_{2}CO_{3}| | |3.6\times 10^{-17}| |
| |BaSO_{3}| | |5.0\times 10^{-10}| | |Hg_{2}Cl_{2}| | |1.43\times 10^{-18}| |
| |Be(OH)_{2}| | |6.92\times 10^{-22}| | |Hg_{2}I_{2}| | |5.2\times 10^{-29}| |
| |CaCO_{3}| | |3.36\times 10^{-9}| | |Hg_{2}SO_{4}| | |6.5\times 10^{-7}| |
| |CaF_{2}| | |3.45\times 10^{-11}| | |HgBr_{2}| | |6.2\times 10^{-20}| |
| |Ca(OH)_{2}| | |5.02\times 10^{-6}| | |HgI_{2}| | |2.9\times 10^{-29}| |
| |Ca_{3}(PO_{4})_{2}| | |2.07\times 10^{-33}| | |Li_{2}CO_{3}| | |8.15\times 10^{-4}| |
| |CaSO_{4}| | |4.93\times 10^{-5}| | |LiF| | |1.84\times 10^{-3}| |
| Substance | |K_{sp}| |
| |Li_{3}PO_{4}| | |2.37\times 10^{-11}| |
| |MgCO_{3}| | |6.82\times 10^{-6}| |
| |MgCO_{3}\times3 H_{2}O| | |2.38\times 10^{-6}| |
| |MgCO_{3}\times5 H_{2}O| | |3.79\times 10^{-6}| |
| |MgF_{2}| | |5.16\times 10^{-11}| |
| |Mg(OH)_{2}| | |5.61\times 10^{-12}| |
| |Mg_{3}(PO_{4})_{2}| | |1.04\times 10^{-24}| |
| |NiCO_{3}| | |1.42\times 10^{-7}| |
| |Ni(OH)_{2}| | |5.48\times 10^{-16}| |
| |Ni_{3}(PO_{4})_{2}| | |4.74\times 10^{-32}| |
| |PbBr_{2}| | |6.60\times 10^{-6}| |
| |PbCO_{3}| | |7.40\times 10^{-14}| |
| |PbCl_{2}| | |1.70\times 10^{-5}| |
| |Pb(OH)_{2}| | |1.43\times 10^{-20}| |
| |PbI_{2}| | |9.8\times 10^{-9}| |
| |PbSO_{4}| | |2.53\times 10^{-8}| |
| |SrCO_{3}| | |5.6\times 10^{-10}| |
| |SrF_{2}| | |4.33\times 10^{-9}| |
| |SrSO_{4}| | |3.44\times 10^{-7}| |
| |Sn(OH)_{2}| | |5.45\times 10^{-27}| |
| |ZnCO_{3}| | |1.46\times 10^{-10}| |
| |ZnCO_{3}\times H_{2}O| | |5.42\times 10^{-11}| |
| |Zn(OH)_{2}| | |3\times 10^{-17}| |
