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6 Rules for the Solubility of Salts
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Nitrates (NO3-)
most are soluble
The Alkali Metals and Ammonium Ions (NH4+)
most are soluable
Chloride, Bromide, and Iodide Salts
most are soluble; exceptions: Ag+, Pb2+, Hg22+
Sulfate (SO42-) Salts
most are soluble; exceptions: BaSO4, PbSO4, Hg2SO4, CaSO4
Hydroxide (OH-)
most are soluble; especially NaOH, KOH; exceptions Ba(OH)2, Sr(OH)2, Ca(OH)2
Sulfide (S2-), Carbonate (CO32-), Chromate (CrO42-), Phosphate (PO43-) Salts
most are insoluble; exceptions: any that include an Alkali Metal or an Ammonium ion