Solubility Rules

group 1 ions (Li+, Na+, etc)

always soluble

ammonium (NH4+)

always soluble

acetate (C2H3O2-)

always soluble

hydrogen carbonate (HCO3-)

always soluble

chlorate (ClO3-)

always soluble

halides (Cl-, Br-, I-)

soluble except when combined with Ag+, Pb-2, Hg2+2)

sulfates (SO4-2)

soluble except when combined with Ag+, Ca+2, Sr+2, Ba+2, or Pb-2

carbonate (CO3-2)

insoluble except when combined with group 1 ions or ammonium (NH4+)

chromate (CrO4-2)

insoluble except when combined with group 1 ions, Ca+2, Mg+2, or ammonium (NH4+)

phosphate (PO43-)

insoluble except when combined with group 1 ions are ammonium (NH4+)

sulfide (S-2)

insoluble except when combined with group 1 ions or ammonium (NH4+)

hydroxide (OH-)

insoluble except when combined with group 1 ions, Ca+2, Ba+2, Sr-2, or ammonium (NH4+)