Solubility Rules

NO3-

All nitrates are soluble

CH3COO-

All acetates are soluble except AgCH3COO

ClO3-, ClO4- (chlorate, perchlorate)

always soluble

Cl- (chloride ion)

All chlorides are soluble except AgCl, Hg2Cl2, PbCl2

Br- (bromide ion)

All bromides are soluble except AgBr, PbBr2, Hg2Br2, HgBr2

I- (iodide ion)

All iodides are soluble except AgI, Hg2I2, HgI2, PbI2,

F- (fluoride ion)

All fluorides are soluble except for Group 2A metals.

SO42-

All sulfates are soluble except BaSO4, PbSO4, Hg2SO4, CaSO4, Ag2SO4, SrSO4

Alkali metal cations (Group IA) and NH4+

All are soluble

H+ ions

All common inorganic acids and low molecular mass organic acids are soluble.

CO3 2-, C2O4 2-

All carbonates and oxalates are insoluble except these of the A elements and NH4+

CrO4 2-

All chromates are insoluble except those of the IA elements, NH4+, CaCrO4 and SrCrO4

OH-

All hydroxides are insoluble except those of the IA elements, NH4+, Ba(OH)2, Sr(OH)2, and Ca(OH)2

PO4 3-

All phosphates are insoluble except these of the A elements and NH4+

SO3 2-

All sulfites are insoluble except these of the A elements and NH4+

S 2-

All sulfides are insoluble except those of the IA and IIA elements and NH4+