Solubility Rules, Yo!

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Anion

Soluble

Insoluble*

Nitrates (NO3-),

Acetates (CH3COO-)

All common cations

No common cations

Chlorides (Cl-)

Most common cations

AgCl, HgCl2.

PbCl2 is borderline.

Bromides (Br-)

Most common cations

AgBr, HgBr2, PbBr2.

Iodides (I-)

Most common cations

AgI, HgI2, PbI2.

Sulfates (SO42-)

Most common cations

SrSO4, BaSO4, SnSO4, PbSO4, Ag2SO4.

CaSO4 is borderline.

Hydroxides (OH-)

NaOH, KOH, LiOH, NH4OH, Sr(OH)2, Ba(OH)2.

Ca(OH)2 is borderline.

Most common cations

Sulfides (S2-)

Na2S, K2S, Li2S, (NH4)2S, MgS, CaS, BaS, SrS

Most common cations

Carbonates (CO32-)

Na2CO3, K2CO3, Li2CO3, (NH4)2CO3

Most common cations

Phosphates (PO42-)

Na3PO4, K3PO4, Li3PO4, (NH4)3PO4

Most common cations

Sulfites (SO32-)

Na2SO3, K2SO3, Li2SO3

Most common cations