AP Chemistry Solubility Rules – Flashcards

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Na+

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soluble (almost all salts)
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K+

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soluble (almost all salts)
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NH4+

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soluble (almost all salts)
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NO3-

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soluble (salts)
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ClO3-

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soluble (salts)
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ClO4-
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soluble (salts)
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CH3COO-

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soluble (salts)
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Cl-
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soluble (almost all salts)

 

Exceptions: halides of Ag+, Hg22+, Pb2+

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Br-
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soluble (almost all salts)

 

Exceptions: halides of Ag+, Hg22+, Pb2+ 

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I-
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soluble (almost all salts)

 

Exceptions: halides of Ag+, Hg22+, Pb2+ 

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F-
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Soluble (almost all compounds)

 

Exceptions: fluorides of

Mg2+, Ca2+, Sr2+, Ba2+, Pb2+

 

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SO42-

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soluble (salts)

 

Exceptions: sulfates of

Ca2+, Sr2+, Ba2+, Pb2+

 

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CO32-

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insoluble (most salts)

 

Exceptions: salts of NH4+ and the alkali metal cations

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PO43-

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insoluble (most salts)

 

Exceptions: salts of NH4+ and the alkali metal cations

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C2O42-

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insoluble (most salts)

 

Exceptions: salts of NH4+ and the alkali metal cations

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CrO42-

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insoluble (most salts)

 

Exceptions: salts of NH4+ and the alkali metal cations

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S2-
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insoluble (most metal sulfides)

 

Exceptions: salts of NH4+ and the alkali metal cations

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Metal hydroxides and oxides
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insoluble (most)

 

Exceptions: salts of NH4+ and the alkali metal cations as well as Ba(OH)2 is soluble

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