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Rule 1 & 2:
Group 1, NH4+, NO3-, CH3COO- never form ppt-always soluble
Rule 3:
Halogens forms ppt with Ag Pb, Hg
Rule #4 SO4-2
forms ppt with Ag, Pb, Hg, Ca, Sr, Ba
Rule #5:
OH- forms ppt with everything except Ca, Sr, Ba
Rule 6:
PO4-3, CrO4-2, CO3-2, HCO3-, Cr2O7-2 all form ppt
Rule 7: S-2
All form ppt except Group II