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Precipitation reactions are used to prepare new compounds and analyze their purity. They occur when aqueous solutions of ionic compounds are combined and a new insoluble ionic compound is produced with a precipitate solid that settles out of the solution. With the Double Replacement Reactions and Solubility: Net Ionic Equations—ChemTopic™ Lab Activity, carry out a series of possible double replacement reactions and observe which combinations produce precipitates to determine general rules of solubility for ionic compounds in water.