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Solubility Rules
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All compounds containing alkali metal cations and the ammonium ion are soluble.
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All compounds containing NO3-, ClO4-, ClO3-, and C2H3O2- anions are soluble.
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All chlorides, bromides, and iodides are soluble except those containing Ag+, Pb2+, or Hg22+.
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All sulfates are soluble except those containing Hg22+, Pb2+, Sr2+, Ca2+, or Ba2+.
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All hydroxides are insoluble except compounds of the alkali metals, Ca2+, Sr2+, and Ba2+.
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All compounds containing PO43-, S2-, CO32-, and SO32- ions are insoluble except those that also contain alkali metals or NH4+.
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