This document summarizes an experiment on precipitation reactions involving double displacement reactions. Aqueous solutions of various cations and anions were mixed in test tubes, including AgNO3, Pb(NO3)2, CaCl2, KI, NaCl, NaOH, FeCl3, KNO3, Na2CO3, and CuSO4. Precipitates formed when AgNO3 was added to solutions of KI, NaCl, CuSO4, Na2CO3, and FeCl3, producing silver iodide, silver chloride, silver sulfate, silver carbonate, and silver chloride respectively. Pb(NO3)2 also formed precipitates when mixed with KI, NaCl,