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Glossary of AP Chemistry Solubility Rules 1088

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alkali metal ions
always soluble
NH4+
always soluble
NO3-
always soluble
ClO3-
always soluble
ClO4-
always soluble
C2H3O2-
always soluble
Cl-
soluble except: Ag+, Pb(2+), Hg2(2+)
Br-
soluble except: Ag+, Pb(2+), Hg2(2+)
I-
soluble except: Ag+, Pb(2+), Hg2(2+)
F-
soluble except Ca(2+), Sr(2+), Ba(2+), Pb(2+), Mg(2+)
SO4(2-)
soluble except Ca(2+), Sr(2+), Ba(2+), Pb(2+)
O(2-)
insoluble except alkali metals, NH4+,
Ca(2+), Sr(2+), Ba(2+)
[last three are somewhat soluble]
OH-
insoluble except alkali metals, NH4+,
Ca(2+), Sr(2+), Ba(2+)
[last three are somewhat soluble]
CO3(2-)
insoluble except alkali metals and NH4+
PO4(3-)
insoluble except alkali metals and NH4+
S(2-)
insoluble except alkali metals and NH4+
SO3(2-)
insoluble except alkali metals and NH4+
C2O4(2-)
insoluble except alkali metals and NH4+
CrO4(2-)
insoluble except alkali metals and NH4+

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