Solubility Rules for Compounds in Aqueous Solution

Rule #1

All common compounds of the Group IA metal ions

(Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺)

and the ammonium ion (NH₄⁺)

are water soluble.

Solubility Rules for Compounds in Aqueous Solution

Rule #2

The common nitrates (NO₃ ^-),

acetates (CH₃COO ^-),

chlorates (ClO₃ ^-),

and perchlorates (ClO₄ ^-)

are water soluble.

Solubility Rules for Compounds in Aqueous Solution

Rule #3

The common

chlorides (Cl ^-),

bromides (Br ^-),

iodides (I ^-)

are water soluble,

except for Ag⁺, Hg₂⁺², Pb⁺² and Co⁺².

Solubility Rules for Compounds in Aqueous Solution

Rule #4

The common fluorides (F ^-) are water soluble,

except for MgF₂, CaF₂, SrF₂, BaF₂, and PbF₂.

Solubility Rules for Compounds in Aqueous Solution

Rule #5

The common sulfates (SO₄^{– 2}) are water soluble

except for PbSO₄, BaSO₄, and Hg₂SO₄, CaSO₄, SrSO₄, and Ag₂SO₄.

Solubility Rules for Compounds in Aqueous Solution

Rule #6

Solubility Rules for Compounds in Aqueous Solution

Rule #7

The common carbonates (CO₃ ^{– 2}), phosphates (PO₄ ^{– 3}), and arsenates (AsO₄ ^{– 3}) are water insoluble,

except for the Group IA metals and NH4+.

Solubility Rules for Compounds in Aqueous Solution

Rule #8

The common sulfides (S ^{– 2}) are water insoluble,

except for the Group IA metals, Group IIA metals, and ammonium (NH₄⁺).