Solubility of Ionic Compounds in Water  

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Key:    S=Soluble       I=Insoluble     D=Decomposes in water       U=Compound does not exist or is unstable

Cation

Anion

Al

+3

NH4

+1

Sb

+3

As

+3

Ba

+2

Bi

+3

Cd

+2

Ca

+2

Cr

+3

Co

+2

Cu

+2

Fe

+3

Fe

+2

H

+1

Pb

+2

Mg

+2

Hg

+2

Hg

+1

Ni

+2

K

+1

Ag

+1

Na

+1

Sr

+2

Zn

+2

C2H3O2 -1

S

S

U

U

S

I

S

S

S

S

S

U

S

S

S

S

S

I

S

S

I

S

S

S

Br-1

S

S

D

D

S

D

S

S

S

S

S

S

S

S

I

S

I

Ia

S

S

Ib

S

S

S

CO3-2

U

S

U

U

I

U

I

I

U

I

I

U

I

S

Ia

Ia

I

Ia

I

S

Ia

S

Ia

Ia

ClO3-1

S

S

U

U

S

U

S

S

U

S

S

U

U

S

S

S

S

S

I

S

S

S

S

S

Cl-1

S

S

S

D

S

D

S

S

S

S

S

S

S

S

I

S

S

Ib

S

S

Ib

S

S

S

CrO4-2

U

S

U

U

Ia

U

I

S

U

I

S

S

I

S

Ia

S

Ia

Ia

U

S

Ia

S

Ia

Ia

OH-1

Ia

U

U

U

S

D

I

Ia

I

I

Ia

Ia

Ia

H2O

Ia

Ia

U

U

I

S

U

S

I

Ia

I-1

S

S

D

S

S

I

S

S

I

S

U

U

S

S

Ia

S

Ia

Ia

S

S

I

S

S

S

NO3-1

S

S

U

U

S

D

S

S

S

S

S

S

S

S

S

S

S

D

S

S

S

S

S

S

O-2

Ib

U

I

I

S

I

I

I

I

I

Ia

Ia

Ia

H2O

I

Ia

I

Ia

I

D

I

D

I

I

C2O4-2

I

I

I

U

I

D

I

I

S

I

I

S

I

S

I

I

I

I

I

S

I

S

I

I

PO4-3

Ia

S

U

U

Ia

I

I

Ia

I

I

Ia

Ia

Ia

S

Ia

Ia

U

U

I

S

Ia

S

Ia

Ia

SiO3-2

I

U

U

U

S

I

I

Ia

U

I

U

U

I

I

Ia

Ia

U

U

U

S

U

S

Ia

Ia

SO4-2

S

S

D

U

Ib

D

S

Ia

S

S

S

S

S

S

I

S

D

I

S

S

I

S

I

S

S-2

D

S

D

I

D

I

I

Ia

I

I

Ia

I

Ia

S

Ia

D

I

I

I

S

Ia

S

I

Ia

SO3-2

U

S

U

U

I

U

I

I

I

I

U

U

I

S

I

S

U

U

I

S

I

S

I

I

 

Ia

 Soluble in Acids

Ib

 Slightly Soluble in Acids H2O  Produces water