Chemistry exam Tips: Solubility Rules

SOLUBILITY RULES
1. Salts of ammonium (NH4 +) and Group IA are always soluble.

2. a. All chlorides (Cl-) are soluble except AgCl, Hg2Cl2, and PbCl2 which are insoluble.
b. All bromides (Br-) are soluble except AgBr, Hg2Br2, HgBr2, and PbBr2 which are insoluble.
c. All iodides (I-) are soluble except AgI, Hg2I2, HgI2, and PbI2 which are insoluble.

3. Chlorates (ClO3-), nitrates (NO3-), and acetates (CH3COO-) are soluble.

4. Sulfates (SO4-2) are soluble except CaSO4, SrSO4, BaSO4, Hg2SO4, HgSO4,PbSO4, and Ag2SO4 which are insoluble.

5. Phosphates (PO4-3), and carbonates (CO3-2) are insoluble except NH4+ and Group IA compounds.

6. All metallic oxides (O-2) are insoluble except NH4+ and Group IA compounds.

7. All metallic hydroxides (OH-) are insoluble except NH4+ and Group IA and Group IIA from calcium down.

8. All sulfides (S-2) are insoluble except NH4 + and Groups IA and IIA.