Chemistry Solubility Rules

Group 1A (Li,Na,K,Rb,Cs)

Group 1A (Li,Na,K,Rb,Cs)

soluble

NH4+ (ammonium)

soluble

C2H3O2 (acetate)

soluble

NO3- (nitrate)

soluble

Cl (chloride)

soluble

Br (bromine)

soluble

I (iodine)

soluble

Exceptions for Cl

lead, mercury, silver

Exception for Br

lead, mercury, silver

Exception for I

lead, mercury, silver

SO4^2- (sulfate)

soluble

Exceptions for SO4^2-

Ca, Sr, Ba, Pb

CO3^2 (carbonate)

insoluble

PO4^3- (phosphate)

insoluble

CrO4^2- (chromate)

insoluble

Exceptions for CO, PO, Cr

Group 1A & NH4+

S2- (sulfur)

insoluble

Exceptions for S2-

Group 1A, 2A, and NH4+

OH- (base)

insoluble

Exceptions for OH-

Group 1A, 2A