Ionic Compounds in Water - Solubility Guidelines
Guidelines or solubility rules to predict whether or not a given ionic compound is soluble in water at room temperature.
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See also Solutions, molarity and dilution and Solubility product constants
| Usually Soluble | Exceptions | |
| Acetates | CH3COO- | Moderately soluble: CH3COOAg |
| Ammonium | NH4+ | |
| Chlorates | ClO3- | |
| Perchlorates | ClO4- | |
| Group 1 cations | Li+ | |
| Na+ | ||
| K+ | ||
| Rb+ | ||
| Cs+ | ||
| Halides | F- | Insoluble: MgF2, CaF2, SrF2, BaF2, PbF2 |
| Cl- | Insoluble: AgCl, Hg2Cl2, PbCl2, | |
| Br - | Insoluble: AgBr, Hg2Br2, PbBr2, | |
| I- | Insoluble: AgI, Hg2I2, PbI2, | |
| Nitrates | NO3- | |
| Nitrites | NO2- | Moderately soluble: AgNO2 |
| Sulfates | SO42- |
Moderate soluble: CaSO4, SrSO4, Ag2SO4 Insoluble: BaSO4, PbSO4, HgSO4 |
| Usually Insoluble | Exceptions | |
| Carbonates | CO32- | Soluble: (NH4)2CO3, Na2CO3, K2CO3 |
| Hydroxides | OH- |
Soluble: LiOH, NaOH, KOH, Ba(OH)2 Moderately soluble: Ca(OH)2, Sr(OH)2 |
| Phosphates | PO43- | Soluble: (NH4)3PO4, Na3PO4, K3PO4 |
| Sulfides | S2- | Soluble: (NH4)2S, Na2S, K2S, MgS, CaS |
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