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what elements are ALWAYS soluble?
alkali ions excluding hydrogen and francium, ammonium, nitrate
Cl- , Br- I- are always soluble except with
Ag+ Pb2+ Hg2 2+
F- is always soluble except with
Ca2+ Ba2+ Sr2+ Pb2+ Mg2+
O2- and OH- are always insoluble except with
Ca2+ Ba2+ Sr2+ alkali ions NH4+
CO3 2- PO4 3- S 2- SO3 2- CrO4 2- C2O4 2- are always insoluble except with
alkali ions and NH4+