APSolubilityRules

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AP Solubility Table
These rules are used only in the Predicting Reaction Section of the AP Exam. We all know that there are no ionic solids that are completely "insoluble" in water.

Soluble in water
1.All nitrate compounds (NO₃^1-) are soluble.
2.All acetates (C₂H₃O₂^1-) are soluble except AgC₂H₃O₂. Acetate can also be represented as CH₃COO^1-
3. All chlorates (ClO₃^1-) are soluble.
4. All alkali metal cations (Group 1) and ammonia (NH₄¹⁺) are soluble.
5. All bromides (Br^1-), chlorides (Cl^1-), and iodides (I^1-) are soluble except:

Silver cpds (AgCl, AgBr, and AgI)
Pb²⁺(Lead II) cpds (PbCl₂, PbBr₂, and PbI₂)
Hg₂²⁺ (Mercury(I) cpds (Hg₂Cl₂, Hg₂Br₂, and Hg₂I₂)
Hg²⁺ (Mercury(II) cpds (HgCl₂, HgBr₂, and HgI₂)

6. All sulfates (SO₄^2-) are soluble except BaSO₄, PbSO₄, Hg₂SO₄, CaSO₄, SrSO₄, and Ag₂SO₄

Insoluble in water
1. All carbonate (CO₃^2-), phosphate (PO₄^3-), and sulfite (SO₃^2-) are insoluble except those of Group 1 elements and ammonia (NH₄¹⁺).
2. All sulfide (S^2-) are insoluble except Group 1 and Group 2 and ammonia (NH₄¹⁺).
3. All chromate (CrO₄^2-) are insoluble except those of Group 1 and ammonia (NH₄¹⁺), CaCrO₄, and SrCrO₄.
4. All hydroxides are insoluble except those of Group 1, ammonia (NH₄¹⁺), Ba(OH)₂, Sr(OH)₂ and Ca(OH)₂.