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Soluble compounds contain:
•group 1 metal cations and the ammonium ion
• the halide ions
• the acetate (CH₃COO)-, bicarbonate (HCO₃)-, nitrate (NO₃)-, and chlorate ions (ClO₃)-
• the sulfate ion (SO₄)-2
Exceptions:
the halides of Ag+ , (Hg2)+2 , Pb+2
Sulfates of Ag+ , (Ba)+2 , (Ca)+2 , (Hg2)+2 , (Pb)+2 , (Sr)+2
Insoluble compounds contain:
carbonate (CO₃)-2 , chromate (CrO₄)-2 , phosphate (PO₄)-3, and sulfide (S²)-
hydroxide ion: OH⁻
Exceptions:
compounds of these ions with group 1 metal cations or ammonium ion NH₄⁺.
hydroxides of group 1 metal cations and Ba2+