Solubility Rules Interactive Guide

Always Soluble Compounds

Group 1 metals (Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺)
Ammonium ion (NH₄⁺)
Nitrates (NO₃⁻)
Perchlorates (ClO₄⁻)
Acetates (CH₃CO₂⁻)

Mostly Soluble Compounds (with exceptions)

Halides (Cl⁻, Br⁻, I⁻)

Exceptions (insoluble):

Ag⁺ compounds
Pb²⁺ compounds
Hg₂²⁺ compounds

Sulfates (SO₄²⁻)

Exceptions (insoluble):

Sr²⁺ compounds
Ba²⁺ compounds
Pb²⁺ compounds
Ca²⁺ (slightly soluble)

Generally Insoluble Compounds

Hydroxides (OH⁻) and Sulfides (S²⁻)

Exceptions (soluble):

Group 1 metal compounds
Ammonium compounds
Alkaline earth sulfides

Carbonates (CO₃²⁻) and Phosphates (PO₄³⁻)

Exceptions (soluble):

Group 1 metal compounds
Ammonium compounds

Interactive Solubility Predictor

Try predicting if a compound will be soluble!