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 ...

The positive and negative ions attract each other and form the ionic compound sodium chloride. One calcium and two chlorine atoms are near each other. An electron from each atom feels the attraction ...

Sodium carbonate, Na 2 CO 3 ... The resin needs recharging with dishwasher salt (sodium chloride) once it becomes full of calcium ions.