group 1
always soluble
NH4+
always soluble
Nitrates (NO3-)
always soluble
Acetates (CH3COO-)
always soluble
hydrogen carbonates (HCO3-)
always soluble
Chlorates (ClO3-)
always soluble
Perchlorates (ClO4-)
always soluble
Halides (Cl-, Br-, I-…)
soluble unless Ag+, Hg22+, Pb2+
Sulfates (SO42-)
soluble unless Ag+, Ca2+, Sr2+, Ba2+, Hg22+, Pb2+
Carbonates (CO32-)
insoluble unless group 1 or NH4+
Phosphates (PO43-)
insoluble unless group 1 or NH4+
Chromates (CrO42-)
insoluble unless group 1 or NH4+
Sulfides (S2-)
insoluble unless group 1 or NH4+
Hydroxides (OH-)
insoluble unless group 1, NH4+, Ba2+