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: The [[reactant]]s in a '''precipitation''' [[Chemical Reaction|reaction]] are [[aqueous]] or [[gas]]eous but at least one of the [[product]]s is an [[insoluble]] [[solid]].
: Some common [[precipitate]] [[Chemical Reaction|reactions]] you may know are:
: ''Lead Nitrate + [[Potassium Iodide ]] → [[Potassium Nitrate ]] + Lead Iodide''
<math>Pb(NO_3)_2(aq) + 2KI(aq) → 2KNO_3(aq) + PbI_2(s)</math>
: ''[[Calcium Oxide]] + [[Carbon Dioxide]] → [[Calcium Carbonate]]''
<math>CaO(aq) + CO_2(g) → CaCO_3(s)</math>