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Soluble
dissociates and dissolves in water (aqueous; can’t be seen)
insoluble
doesn’t dissociate or dissolve in water (forms a solid; precipitate can be seen)
Alkali metals
always soluble
nitrates (NO3)
always soluble
ammonium (NH4)
always soluble
chlorates (ClO3)
always soluble
acetates (CH3COO)
always soluble
Chlorides (Cl)
almost always soluble
EXCEPT
-silver
-mercury (I)
-lead (II)
Bromides (Br)
almost always soluble
EXCEPT
-silver
-mercury (I)
-lead (II)
Iodides (I)
almost always soluble
EXCEPT
-silver
-mercury (I)
-lead (II)
Sulfates (SO4)
almost always soluble
EXCEPT
-calcium
-strontium
-barium
-mercury (I)
-lead (II)
Carbonates
almost always insoluble
EXCEPT
-alkali metals
-ammonium
Phosphates (PO4)
almost always insoluble
EXCEPT
-alkali metals
-ammonium
Silicates (SiO4)
almost always insoluble
EXCEPT
-alkali metals
-ammonium
Hydroxides (OH)
almost always insoluble
EXCEPT
-alkali metals
-ammonium
-calcium
-strontium
-barium