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Precipitation Rules

QuestionAnswer
NO3- All soluble
C2H3O2- All soluble, AgC2H3O2 moderately soluble
Cl-, Br-, I- All soluble except Ag+, Pb2+, and Hg2 2+ (PbCl2 slightly soluble in cold water and moderately soluble in hot water)
SO4 2- All soluble except Ba2+, Pb2+, Ca2+, and Sr2+
CO3 2- and PO4 3- All insoluble except Na+, K+, NH4+ (many acid phosphates are soluble)
OH- All insoluble except Na+ and K+. Hydroxides of Ba2+ and Ca2+ slightly soluble
S2- All insoluble except Na+, K+, NH4+ and those of the alkaline earth metals (sulfides of Al3+ and Cr3+ hydrolyze and precipitate as corresponding hydroxides)
Na+, K+, NH4 + All soluble except for a few uncommon ones
Created by: Evan_Young
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