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Ionic Compounds in Water - Solubility Guidelines

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See also Solutions, molarity and dilution and Solubility product constants

Ionic Compounds in Water - Usually Soluble
Usually Soluble Exceptions
Acetates CH3 COO - Moderately soluble: CH3 COOAg
Ammonium NH 4 +
Chlorates ClO3 -
Perchlorates ClO 4 -
Group 1 cations Li +
Na +
K +
Rb +
Cs +
Halides F - Insoluble: MgF2, CaF2, SrF2, BaF2, PbF 2
Cl - Insoluble: AgCl, Hg2Cl2, PbCl2,
Br - Insoluble: AgBr, Hg2Br2, PbBr2,
I - Insoluble: AgI, Hg2I2, PbI2,
Nitrates NO3 -
Nitrites NO2 - Moderately soluble: AgNO 2
Sulfates SO 4 2-

Moderate soluble: CaSO 4 , SrSO 4 , Ag2SO 4

Insoluble: BaSO 4 , PbSO 4 , HgSO 4

Ionic Compounds in Water - Usually Insoluble
Usually Insoluble Exceptions
Carbonates CO3 2- Soluble: (NH 4 )2CO3, Na2CO3, K2CO3
Hydroxides OH -

Soluble: LiOH, NaOH, KOH, Ba(OH) 2

Moderately soluble: Ca(OH)2, Sr(OH) 2

Phosphates PO 4 3- Soluble: (NH 4 )3 PO 4 , Na3 PO 4 , K3 PO 4
Sulfides S 2- Soluble: (NH 4 )2S, Na2S, K2S, MgS, CaS
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