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Solubility Product Constants at 25 Degrees Celsius

Ionic Equilibrium Table

The solubility product works as follows: In a water solution at equilibrium with a slightly soluble ionic compound, the product of the concentration of the ions, raised to the power of its coefficient in the solubility equation, is a constant. The solubility constant, Ksp, has a fixed value at a given temperature and is independent of the concentration of the individual ions. Here are values of Ksp for several slightly soluble ionic solids:

Actetates
AgC2H3O2 -- 2 x 10-3

Bromides
AgBr -- 5 x 10-13
PbBr2 -- 5 x 10-6

Carbonates
BaCO3 -- 2 x 10-9
CaCO3 -- 5 x 10-9
MgCO3 -- 2 x 10-8

Chlorides
AgCl -- 1.6 x 10-10
Hg2Cl2 -- 1 x 10-18
PbCl2 -- 1.7 x 10-5

Chromates
Ag2CrO4 -- 2 x 10-12
BaCrO4 -- 2 x 10-10
PbCrO4 -- 1 x 10-16
SrCrO4 -- 4 x 10-5

Fluorides
BaF2 -- 2 x 10-6
CaF2 -- 2 x 10-10
PbF2 -- 4 x 10-8

Hydroxides
Al(OH)3 -- 5 x 10-33
Cr(OH)3 -- 4 x 10-38
Fe(OH)2 -- 1 x 10-15
Fe(OH)3 -- 5 x 10-38
Mg(OH)2 -- 1 x 10-11
Zn(OH)2 -- 5 x 10-17

Iodides
AgI -- 1 x 10-16
PbI2 -- 1 x 10-8

Sulfates
BaSO4 -- 1.4 x 10-9
CaSO4 -- 3 x 10-5
PbSO4 -- 1 x 10-8

Sulfides
Ag2S -- 1 x 10-49
CdS -- 1 x 10-26
CoS -- 1 x 10-20
CuS -- 1 x 10-35
FeS -- 1 x 10-17
HgS -- 1 x 10-52
MnS -- 1 x 10-15
NiS -- 1 x 10-19
PbS -- 1 x 10-27
ZnS -- 1 x 10-20

Anne Marie Helmenstine, Ph.D.

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