Solubility Table

Solubility of common ionic compounds in water at ~25°C. Tap any cell for details.

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	Cl⁻	Br⁻	I⁻	NO₃⁻	CH₃COO⁻	SO₄²⁻	CO₃²⁻	PO₄³⁻	OH⁻	S²⁻	CrO₄²⁻
Li⁺	S	S	S	S	S	S	S	S	S	S	S
Na⁺	S	S	S	S	S	S	S	S	S	S	S
K⁺	S	S	S	S	S	S	S	S	S	S	S
NH₄⁺	S	S	S	S	S	S	S	S	S	S	S
Mg²⁺	S	S	S	S	S	S	I	I	I	S	S
Ca²⁺	S	S	S	S	S	SS	I	I	SS	S	S
Sr²⁺	S	S	S	S	S	I	I	I	SS	S	S
Ba²⁺	S	S	S	S	S	I	I	I	S	S	I
Fe²⁺	S	S	S	S	S	S	I	I	I	I	S
Fe³⁺	S	S	S	S	S	S	I	I	I	I	S
Cu²⁺	S	S	S	S	S	S	I	I	I	I	S
Zn²⁺	S	S	S	S	S	S	I	I	I	I	S
Ag⁺	I	I	I	S	S	SS	I	I	I	I	I
Pb²⁺	SS	SS	I	S	S	I	I	I	I	I	I
Hg₂²⁺	I	I	I	S	S	I	I	I	I	I	I
Al³⁺	S	S	S	S	S	S	I	I	I	I	S

SSolubleIInsolubleSSSlightly Soluble

General Solubility Rules

1. All nitrates (NO₃⁻) and acetates (CH₃COO⁻) are soluble.

2. All alkali metal (Li⁺, Na⁺, K⁺) and ammonium (NH₄⁺) salts are soluble.

3. All chlorides, bromides, and iodides are soluble except those of Ag⁺, Pb²⁺, and Hg₂²⁺.

4. All sulfates are soluble except BaSO₄, SrSO₄, PbSO₄ (CaSO₄ and Ag₂SO₄ are slightly soluble).

5. Most hydroxides are insoluble except alkali metals, Ba(OH)₂, and Ca(OH)₂ (slightly).

6. Most carbonates, phosphates, sulfides, and chromates are insoluble except those of alkali metals and NH₄⁺.