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Group 1 and NH4 +1
Never ppt- always soluble
NO3 -1 and CH3COO -1
Never form ppt- always soluble
Halogens
Forms ppt with Ag, Pb, Hg
SO4 -2
Forms ppt with Ag, Pb, Hg, Ca, Sr, Ba
OH -1
Forms ppt with everything except Ca, Sr, Ba
All form ppt
PO4 -3, CrO4 -2, CO3 -2, HCO3 -1, Cr2O7 -2
S -2
All form ppt except group II