Solubility Rules

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Gen Chem115 Module 2 Solubility Rules

Last updated 9:29 PM on 9/20/26
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10 Terms

1
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Alkali metals

Always Soluble.

  • Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺, and Fr⁺


2
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Ammonium (NH4+)

Always Soluble. No Exceptions.

3
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Nitrate (NO3-)

Always Soluble. No exceptions.

4
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Acetate (CH3COO-)

Always Soluble. No exceptions.

5
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F- / Cl- / Br- / I-

Always Soluble.

  • Exception: compounds with Ag+, Hg22+, and Pb2+.


6
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Sulfate (SO42-)

Always Soluble.

  • Except for its compounds with Sr2+, Ba2+, Hg22+, and Pb2+.


7
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Sulfur (S2-)

Not Soluble.

  • Except for alkali metals, ammonium, nitrate, acetate, Ca2+, Sr2+, and Ba2+.


8
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Carbonate (CO32-)

Not Soluble.

  • Except for compounds with alkali metals, ammonium, nitrate, and acetate.


9
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Phosphate (PO43-)

Not Soluble.

  • Except for compounds with alkali metals, ammonium, nitrate, and acetate.


10
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Hydroxide (OH-)

Not Soluble.

  • Except for compounds with alkali metals, ammonium, nitrate, acetate, Ca2+, Sr2+, and Ba2+.