Solubility Guidelines

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1

Group 1 and NH4+ these salts are soluble regardless of anion
2

NO3-, C2H3O2 (acetate), ClO4- are soluble regardless
3

Cl-, Br-, I- are soluble except Ag+, Pb2+, Hg2+
4

SO₄2- are soluble except Ag+, Hg₂2+, Hg3+, Ca2+, Sr2+, Ba2+
5

OH-, insoluble except group 1, NH4+, Ca2+, Sr+, Br+
6

S2- insoluble, except, group 1, NH4+, group 2
7

oxides O2-, carbonates CO₃2-, phosphates PO₄3-, insoluble except group 1, NH4+
Low density

Group 1 and NH4+ since they are not as compact as others on the right
High density

Insoluble since they have high charge and small size