Question: are all polyatomic ions soluble?
Answer: Solubility Rules Make sure you know the following solubility rules. ... 3) Chlorates, acetates, and nitrates (CANs) are soluble. 4) Sulfates are soluble except with Ca, Sr, Ba, Ag, Hg, and Pb which are insoluble. 5) Phosphates, carbonates, and sulfides are insoluble except ammonium and alkali metal compounds are soluble.