A simple demonstration of how a precipitate is evidence of a chemical reaction taking place is performed by mixing solutions of calcium chloride and sodium carbonate to form the precipitate calcium carbonate (CaCO3). CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl(aq) To Conduct Demonstration
Demo Time: ~5 minute Safety and DisposalWash your hands after demonstration. Calcium chloride is an irritant. ReferenceH.W. Hanna and A. Dittmar; Laboratory Manual for General Chemistry, 4th ed.; Morton Publishing Company, Denver, Colorado. (This demonstration has been altered, the original used barium chloride and potassium chromate, which are toxic. Reference is for original version.) Acknowledgement:Laurel Hyde Boni, Kristin Boles |