Precipitation is the formation of a solid in a solution during a chemical reaction. When the reaction occurs, the solid formed is called the precipitate, and the liquid remaining above the solid is called the supernate. Uses of precipitation reactions Precipitation reactions can be used for making pigments, removing salts from water in water treatment, and for qualitative chemical analysis. This effect is useful in many industrial and scientific applications whereby a chemical reaction may pr… (More on Precipitate)