How is a precipitate created?

Answer:
A precipitate is formed when two chemicals combine where one or more of which contains an "insoluble" element or compound. All Carbonates and Phosphates except Ammonium are insoluble. In addition, all Hydroxides except Strontium and Barium are insoluble. All Sulfides minus group II and Ammonium are also insoluble. Finally, all Oxides are also insoluble and will mandate the production of a precipitate in a reaction. It is important to remember that ALL group I elements, Ammonium, Strontium and Barium are soluble and should not be considered.
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