Solubility of Various Ionic Compounds

Concept sheet | Chemistry

Secondary

Below is an exhaustive list of the possible solubility in water at 25 °C for various ionic compounds.

Legend:
• indicates a compound that has little or no solubility in water at 25 °C
º indicates a compound soluble in water at 25 °C
- indicates two ions that do not form an ionic compound

Negative ions	Positive ions
Negative ions	\|NH_{4}^{+}\|	\|Li^{+}\|	\|Na^{+}\|	\|K^{+}\|	\|Mg^{2+}\|	\|Ca^{2+}\|	\|Ba^{2+}\|	\|Al^{3+}\|	\|Cu^{2+}\|
\|CH_{3}COO^{-}\|	°	°	°	°	°	°	°	°	°
\|NO_{3}^{ -}\|	°	°	°	°	°	°	°	°	°
\|Cl^{-}\|	°	°	°	°	°	°	°	°	°
\|Br^{-}\|	°	°	°	°	°	°	°	°	°
\|I^{-}\|	°	°	°	°	°	°	°	°	°
\|SO_{4}^{ 2-}\|	°	°	°	°	°	•	•	°	°
\|SO_{3}^{ 2-}\|	°	°	°	°	•	•	•	-	-
\|S^{2-}\|	°	°	°	°	-	-	-	-	•
\|CO_{3}^{ 2-}\|	°	•	°	°	•	•	•	-	•
\|OH^{-}\|	°	°	°	°	•	•	°	•	•
\|PO_{4}^{ 3-}\|	°	°	°	°	•	•	•	•	•
\|CrO_{4}^{ 2-}\|	°	°	°	°	°	°	•	-	•

Negative ions	Positive ions
Negative ions	\|Fe^{2+}\|	\|Fe^{3+}\|	\|Ni^{2+}\|	\|Zn^{2+}\|	\|Hg^{2+}\|	\|Ag^{+}\|	\|Sn^{2+}\|	\|Pb^{2+}\|
\|CH_{3}COO^{-}\|	°	°	°	°	°	•	-	°
\|NO_{3}^{ -}\|	°	°	°	°	°	°	°	°
\|Cl^{-}\|	°	°	°	°	°	•	°	•
\|Br^{-}\|	°	°	°	°	•	•	°	•
\|I^{-}\|	°	-	°	°	•	•	°	•
\|SO_{4}^{ 2-}\|	°	°	°	°	-	°	°	•
\|SO_{3}^{ 2-}\|	•	-	-	•	-	•	-	•
\|S^{2-}\|	•	•	•	•	•	•	•	•
\|CO_{3}^{ 2-}\|	•	-	•	•	-	•	-	•
\|OH^{-}\|	•	•	•	•	•	•	•	•
\|PO_{4}^{ 3-}\|	•	•	•	•	•	•	-	•
\|CrO_{4}^{ 2-}\|	-	•	•	•	•	•	-	•

The tables below can be summarized using the following rules:

1.	Sodium, potassium, and ammonium salts are soluble.
2.	Nitrates, and acetates are soluble.
3.	Silver and lead (II) salts are often insoluble.
4.	Chlorides, bromides, and iodides are often soluble.
5.	Carbonates, sulphides, and hydroxides are often insoluble.
6.	Sulphates are often soluble.