Memorize Solubility Rules for Ionic Compounds in Chemistry

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Last updated 9:18 PM on 10/3/26
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8 Terms

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Solubility Rule 1

Compounds containing alkali metals (Group 1 ions) and ammonium (NH4) ions are soluble.

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Solubility Rule 2

Compounds of nitrate (NO3), acetate (CH3COO), hydrogen carbonate (HCO3), perchlorate (ClO), and chlorates (ClO3) are soluble.

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Solubility Rule 3

Compounds containing halide (Group 17: Cl-, Br-, and I-) ions are soluble except when combined with Ag+, Pb+2, and Hg2+2.

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Note on Fluorides

Most fluorides (F) are insoluble except those with alkali metals and ammonium.

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Solubility Rule 4

Compounds of hydroxides (OH) are relatively insoluble, except the hydroxides of alkali metals, NH4OH, Ca(OH)2, Sr(OH)2, Ba(OH)2.

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Solubility Rule 5

Compounds of sulfate are soluble, except BaSO4, PbSO4, Hg2SO4, SrSO4, CaSO4.

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Solubility Rule 6

Compounds of sulfide (S²), carbonate (CO3²), chromate (CrO4²), and phosphate (PO4³) are relatively insoluble, except those compounds that apply to rule #1 above.

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SNAP Mnemonic

S-Sodium, N-Ammonium, A-Acetate, P-Potassium.