Solubility
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Is this compound soluble in water?
Soluble
Insoluble
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Solubility rules
1. Always soluble
Cations:
Ammonium (NH₄⁺), Alkali metals (Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺)
Anions:
Chlorates (ClO₃⁻), Nitrates (NO₃⁻), Acetates (C₂H₃O₂⁻)
2. Insoluble (if rule 1 ions are not present)
Cations:
Ag⁺, Pb²⁺, Hg₂²⁺
Anions:
Phosphates (PO₄³⁻), Carbonates (CO₃²⁻), Sulfides (S²⁻), Hydroxides* (OH⁻), Oxides (O²⁻), Chromates** (CrO₄²⁻)
*Group 2 hydroxides are soluble except Mg(OH)₂
**Group 2 chromates are soluble except BaCrO₄
3. Soluble (if rule 2 cations are not present)
Anions:
Chlorides (Cl⁻), Bromides (Br⁻), Iodides (I⁻), Sulfates* (SO₄²⁻)
*CaSO₄, SrSO₄, BaSO₄ are insoluble
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