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Group 1 elements and ammonium are soluble (applies to Li+, Na+,
K+, NH4+)
No exceptions
Acetates and Nitrates are soluble (applies to C2H3O2-,
NO3-)
No exceptions
Most Chlorides, Bromides, and Iodidies are soluble (applies to Cl-, Br-, I-)
Except when paired with Cu+, Ag+, Hg2 2+, Pb2+
Most Sulfates are soluble (applies to SO4 2-)
Except when paired with Ca2+, Sr2+, Ba2+, Ag+, Hg22+, Pb2+)
Carbonates, Phosphates and Fluorides are insoluble (applies to CO32-, PO43-, F-)
Except when pair with Group 1 and NH4+ (ammonium)
Hydroxides and Sulfides are insoluble (applies to OH-, S2-)
except when paired with Group 1 or NH4+, or Ca2+, Sr2+, Ba2)
Combining anions and cations not listed in any of the rules results in…
the formation of an insoluble compound